Macaca noun macaques; rhesus monkeys macadam



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onychophoran - noun any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms

  • onychosis - noun any disease or disorder of the nails

  • onymous - adj. bearing a name

  • onyxis - noun toenail having its free tip or edges embedded in the surrounding flesh

  • oogenesis - noun development of ova

  • oology - noun the branch of zoology that studies eggs (especially birds' eggs and their size, shape, coloration, and number)

  • oolong - noun Chinese tea leaves that have been partially fermented before being dried

  • oomycetes - noun nonphotosynthetic fungi that resemble algae and that reproduce by forming oospores; sometimes classified as protoctists

  • oophorectomy - noun surgical removal of one of both ovaries

  • oophoritis - noun inflammation of one or both ovaries

  • oophorosalpingectomy - noun surgical removal of one or both ovaries and the corresponding Fallopian tubes

  • oosphere - noun used especially of lower plants

  • oospore - noun a thick-walled sexual spore that develops from a fertilized oosphere in some algae and fungi

  • ootid - noun mature ovum after penetration by sperm but before the formation of a zygote

  • oozy - adj. leaking out slowly

  • opacification - noun the process of becoming cloudy or opaque

  • opacify - verb become opaque; make opaque

  • opah - noun large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean

  • opalesce - verb exhibit a play of colors like that of an opal; reflect light or colors like an opal

  • opalescence - noun the visual property of something having a milky brightness and a play of colors from the surface

  • opaline - adj. having a play of lustrous rainbow-like colors

  • opalize - verb replace or convert into opal; make opalescent

  • opaquely - adv. in an opaque manner

  • opaqueness - noun the quality of being opaque to a degree; the degree to which something reduces the passage of light; incomprehensibility resulting from obscurity of meaning

  • openbill - noun stork with a grooved bill whose upper and lower parts touch only at the base and tip

  • opencast - adj. (of mines and mining) worked from the exposed surface

  • opener - noun a hand tool used for opening sealed containers (bottles or cans); the first event in a series; a person who unfastens or unwraps or opens

  • openhanded - adj. given or giving freely

  • openhandedness - noun liberality in bestowing gifts; extremely liberal and generous of spirit

  • openhearted - adj. freely communicative; candidly straightforward; showing or motivated by sympathy and understanding and generosity

  • opening - adj. first or beginning; noun the act of opening something; becoming open or being made open; a recognized sequence of moves at the beginning of a game of chess; a vacant or unobstructed space that is man-made; the initial part of the introduction; the first performance (as of a theatrical production); a ceremony accompanying the start of some enterprise; an open or empty space in or between things; opportunity especially for employment or promotion; the first of a series of actions; an entrance equipped with a hatch; especially a passageway between decks of a ship; an aperture or hole that opens into a bodily cavity; a possible alternative

  • openly - adv. in an open way

  • openmouthed - adj. with eyes or mouth open in surprise

  • openness - noun characterized by an attitude of ready accessibility (especially about one's actions or purposes); without concealment; not secretive; without obstructions to passage or view; willingness or readiness to receive (especially impressions or ideas)

  • openwork - noun ornamental work (such a embroidery or latticework) having a pattern of openings

  • operagoer - noun a patron of the opera

  • operating - adj. involved in a kind of operation; being in effect or operation

  • operation - noun the activity of operating something (a machine or business etc.); a planned activity involving many people performing various actions; a process or series of acts especially of a practical or mechanical nature involved in a particular form of work; a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body; activity by a military or naval force (as a maneuver or campaign); a business especially one run on a large scale; (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction); process or manner of functioning or operating; the state of being in effect or being operative; (mathematics) calculation by mathematical methods; (psychology) the performance of some composite cognitive activity; an operation that affects mental contents

  • operational - adj. being in effect or operation; of or intended for or involved in military operations; pertaining to a process or series of actions for achieving a result; fit or ready for use or service

  • operationalism - noun (philosophy) the doctrine that the meaning of a proposition consists of the operations involved in proving or applying it

  • operationalist - adj. of or relating to or espousing operationalism

  • operative - adj. being in force or having or exerting force; effective; producing a desired effect; of or relating to a surgical operation; (of e.g. a machine) performing or capable of performing; relating to or requiring or amenable to treatment by surgery especially as opposed to medicine; noun someone who can be employed as a detective to collect information; a person secretly employed in espionage for a government

  • operatively - adv. by means of an operative

  • operator - noun an agent that operates some apparatus or machine; someone who owns or operates a business; a speculator who trades aggressively on stock or commodity markets; (mathematics) a symbol that represents a function from functions to functions; a shrewd or unscrupulous person who knows how to circumvent difficulties

  • operculate - adj. having an operculum

  • operculated - adj. having an operculum

  • operculum - noun a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted

  • operose - adj. characterized by toilsome effort to the point of exhaustion; especially physical effort

  • operoseness - noun the quality of requiring extended effort

  • ophidia - noun snakes

  • ophidian - noun limbless scaly elongate reptile; some are venomous

  • ophidiidae - noun eellike marine fishes

  • ophioglossaceae - noun a family of succulent ferns of order Ophioglossales; cosmopolitan in distribution

  • ophioglossales - noun coextensive with the family Ophioglossaceae

  • ophioglossum - noun the type genus of the fern family Ophioglossaceae

  • ophiolatry - noun the worship of snakes

  • ophisaurus - noun glass lizards

  • ophiurida - noun brittle stars

  • ophiuroidea - noun brittle stars and basket stars

  • ophryon - noun the craniometric point in the midline of the forehead immediately above the orbits

  • ophrys - noun a hardy genus of terrestrial orchids of Europe and northern Africa and western Asia

  • ophthalmectomy - noun surgical removal of an eye

  • ophthalmia - noun severe conjunctivitis

  • ophthalmitis - noun severe conjunctivitis

  • ophthalmologist - noun a medical doctor specializing in the treatment of diseases of the eye

  • ophthalmoplegia - noun paralysis of the motor nerves of the eye

  • ophthalmoscope - noun medical instrument for examining the retina of the eye

  • ophthalmoscopy - noun examination of the interior of an eye using an ophthalmoscope

  • opiliones - noun harvestmen

  • opinionated - adj. obstinate in your opinions

  • opinionative - adj. obstinate in your opinions

  • opisthobranchia - noun gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares

  • opisthocomidae - noun comprising the hoatzins

  • opisthognathidae - noun jawfishes

  • opisthognathous - adj. having receding jaws

  • opisthorchiasis - noun infestation with flukes obtained from eating raw fish; common in eastern Asia

  • opisthotonos - noun severe spasm in which the back arches and the head bends back and heels flex toward the back

  • opopanax - noun an odorous gum resin formerly used in medicines

  • oporto - noun port city in northwest Portugal; noted for port wine

  • opportunely - adv. at an opportune time

  • opportuneness - noun timely convenience

  • opportunism - noun taking advantage of opportunities without regard for the consequences for others

  • opportunist - adj. taking immediate advantage, often unethically, of any circumstance of possible benefit; noun a person who places expediency above principle

  • opportunistic - adj. taking immediate advantage, often unethically, of any circumstance of possible benefit

  • opportunity - noun a possibility due to a favorable combination of circumstances

  • opposed - adj. being in opposition or having an opponent; in opposition to (a policy or attitude etc.)

  • opposer - noun someone who offers opposition

  • opposing - adj. characterized by active hostility; in opposition to (a policy or attitude etc.)

  • oppositely - adv. in an opposite position

  • oppositeness - noun the relation between opposed entities

  • oppositive - adj. expressing antithesis or opposition

  • oppressed - adj. burdened psychologically or mentally

  • oppressively - adv. in a heavy and oppressive way

  • oppressiveness - noun unwelcome burdensome difficulty; a feeling of being oppressed

  • opprobrious - adj. (used of conduct or character) deserving or bringing disgrace or shame; expressing offensive reproach

  • oppugn - verb challenge the accuracy, probity, or propriety of

  • opsonin - noun an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes

  • opsonization - noun process whereby opsonins make an invading microorganism more susceptible to phagocytosis

  • opsonize - verb make (cells) more susceptible to the action of phagocytes

  • optative - adj. relating to a mood of verbs in some languages; indicating an option or wish; noun a mood (as in Greek or Sanskrit) that expresses a wish or hope; expressed in English by modal verbs

  • optical - adj. of or relating to or involving light or optics; relating to or using sight; of or relating to or resembling the eye

  • optically - adv. in an optical manner

  • optician - noun a worker who makes glasses for remedying defects of vision

  • optics - noun the branch of physics that studies the physical properties of light

  • optimistically - adv. with optimism; in an optimistic manner

  • optimization - noun the act of rendering optimal

  • optimize - verb act as an optimist and take a sunny view of the world; modify to achieve maximum efficiency in storage capacity or time or cost; make optimal; get the most out of; use best

  • optional - adj. possible but not necessary; left to personal choice

  • optionally - adv. in an optional manner

  • opulence - noun wealth as evidenced by sumptuous living

  • opulently - adv. in a sumptuous and opulent manner

  • opuntia - noun large genus of cactuses native to America: prickly pears

  • opuntiales - noun coextensive with the family Cactaceae: cactuses

  • orach - noun any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes

  • orad - adv. toward the mouth or oral region

  • orally - adv. by spoken rather than written means; (of drugs) through the mouth rather than through injection

  • orang - noun large long-armed ape of Borneo and Sumatra having arboreal habits

  • orangeade - noun sweetened beverage of diluted orange juice

  • orangeman - noun a member of a society founded in Ireland in 1795 to uphold Protestantism and the British sovereign

  • orangery - noun a place where oranges are grown; a plantation of orange trees in warm climes or a greenhouse in cooler areas

  • orangewood - noun fine-grained wood of an orange tree; used in fine woodwork

  • oration - noun an instance of oratory

  • orator - noun a person who delivers a speech or oration

  • orbicular - adj. having the shape of a sphere or ball; circular or nearly circular

  • orbiculate - adj. circular or nearly circular

  • orbitale - noun the craniometric point at the lowest point on the lower edge of the orbit

  • orca - noun predatory black-and-white toothed whale with large dorsal fin; common in cold seas

  • orchestia - noun type genus of the family Orchestiidae

  • orchestiidae - noun beach fleas

  • orchestration - noun the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments; an arrangement of events that attempts to achieve a maximum effect; an arrangement of a piece of music for performance by an orchestra or band

  • orchestrator - noun an arranger who writes for orchestras

  • orchidaceae - noun enormous cosmopolitan family of perennial terrestrial or epiphytic plants with fleshy tubers or rootstocks and unusual flowers

  • orchidales - noun order of plants with irregular flowers having minute seeds: Orchidaceae; Burmanniaceae

  • orchidalgia - noun pain in the testes

  • orchidectomy - noun surgical removal of one or both testicles

  • orchiectomy - noun surgical removal of one or both testicles

  • orchil - noun a purplish dye obtained from orchil lichens; any of various lecanoras that yield the dye archil

  • orchiopexy - noun operation to bring an undescended testicle into the scrotum

  • orchitis - noun inflammation of one or both testes; characterized by pain and swelling

  • orchotomy - noun surgical incision into the testis to obtain material for analysis (as in cases of abnormally low sperm count)

  • orcinus - noun killer whales

  • ordainer - noun a cleric who ordains; a cleric who admits someone to holy orders

  • ordered - adj. having a systematic arrangement; especially having elements succeeding in order according to rule; marked by system or regularity or discipline; marked by an orderly, logical, and aesthetically consistent relation of parts; disposed or placed in a particular kind of order

  • orderer - noun an organizer who puts things in order; someone who places an order to buy

  • orderliness - noun the quality of appreciating method and system; a condition of regular or proper arrangement

  • ordinand - noun a person being ordained

  • ordinarily - adv. under normal conditions

  • ordinariness - noun the quality of being commonplace and ordinary

  • ordination - noun the act of ordaining; the act of conferring (or receiving) holy orders; the status of being ordained to a sacred office; logical or comprehensible arrangement of separate elements

  • ordovician - noun from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds

  • ordure - noun solid excretory product evacuated from the bowels

  • oread - noun (Greek mythology) one of the mountain nymphs

  • oreamnos - noun mountain goats

  • oreortyx - noun mountain quail of western United States

  • organelle - noun a specialized part of a cell; analogous to an organ

  • organically - adv. involving carbon compounds; as an important constituent; in an organic manner

  • organicism - noun theory that the total organization of an organism rather than the functioning of individual organs is the determinant of life processes

  • organicistic - adj. relating to or tending toward organicism

  • organism - noun a living thing that has (or can develop) the ability to act or function independently; a system considered analogous in structure or function to a living body

  • organismal - adj. of or relating to or belonging to an organism (considered as a whole)

  • organist - noun a person who plays an organ

  • organization - noun the activity or result of distributing or disposing persons or things properly or methodically; the act of organizing a business or an activity related to a business; an ordered manner; orderliness by virtue of being methodical and well organized; a group of people who work together; the act of forming something; an organized structure for arranging or classifying; the persons (or committees or departments etc.) who make up a body for the purpose of administering something

  • organizational - adj. of or relating to an organization

  • organizationally - adv. with regard to organization

  • organize - verb bring order and organization to; arrange by systematic planning and united effort; cause to be structured or ordered or operating according to some principle or idea; plan and direct (a complex undertaking); form or join a union; create (as an entity)

  • organized - adj. methodical and efficient in arrangement or function; formed into a structured or coherent whole; being a member of or formed into a labor union

  • organizer - noun a person who brings order and organization to an enterprise; someone who enlists workers to join a union; a lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; can serve as a diary or a personal database or a telephone or an alarm clock etc.

  • organon - noun a system of principles for philosophic or scientific investigations; an instrument for acquiring knowledge

  • organza - noun a fabric made of silk or a silklike fabric that resembles organdy

  • oriel - noun a projecting bay window corbeled or cantilevered out from a wall

  • orientalism - noun the quality or customs or mannerisms characteristic of Asian civilizations; the scholarly knowledge of Asian cultures and languages and people

  • orientalist - noun a specialist in oriental subjects

  • orientalize - verb make oriental in character

  • orientate - verb determine one's position with reference to another point

  • orientation - noun the act of orienting; a person's awareness of self with regard to position and time and place and personal relationships; an integrated set of attitudes and beliefs; position or alignment relative to points of the compass or other specific directions; a course introducing a new situation or environment; a predisposition in favor of something

  • oriflamme - noun a red or orange-red flag used as a standard by early French kings; an inspiring symbol or ideal that serves as a rallying point in a struggle

  • origami - noun the Japanese art of folding paper into shapes representing objects (e.g., flowers or birds)

  • origanum - noun any of various fragrant aromatic herbs of the genus Origanum used as seasonings
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