| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| affenpinscher | (noun) European breed of small dog resembling a terrier with dark wiry hair and a tufted muzzle | Synonyms: monkey dog, monkey pinscher |
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| afterpiece | (noun) a brief dramatic piece (usually comic) presented after a play | - |
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| allotropism | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropy |
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| allspice | (noun) ground dried berrylike fruit of a West Indian allspice tree; suggesting combined flavors of cinnamon and nutmeg and cloves | - |
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| (noun) aromatic West Indian tree that produces allspice berries | Synonyms: allspice tree, Pimenta dioica, pimento tree |
| (noun) deciduous shrubs having aromatic bark; eastern China; southwestern and eastern United States | - |
| alpinist | (noun) a mountain climber who specializes in difficult climbs | - |
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| altarpiece | (noun) a painted or carved screen placed above and behind an altar or communion table | Synonyms: reredos |
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| amblyopia | (noun) visual impairment without apparent organic pathology | - |
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| ametropia | (noun) (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia | - |
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| ampicillin | (noun) semisynthetic penicillin (trade names Principen and Polycillin and SK-Ampicillin) | Synonyms: Polycillin, Principen, SK-Ampicillin |
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| anaspid | (noun) extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian | - |
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| anisometropia | (noun) difference in the refractive power of the two eyes | - |
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| anopia | (noun) sightlessness (especially because of a structural defect in or the absence of an eye) | - |
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| anorthopia | (noun) distorted vision in which straight lines appear curved | - |
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| antiepileptic | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant, anticonvulsant drug, antiepileptic drug |
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| antiperspirant | (noun) an astringent substance applied to the skin to reduce perspiration | - |
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| apiarist | (noun) a farmer who keeps bees for their honey | Synonyms: apiculturist, beekeeper |
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| apiary | (noun) a shed containing a number of beehives | Synonyms: bee house |
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| apicalization | (noun) (phonetics) An articulatory feature of phones, usually consonants, produced by obstructing the air passage with the tip of the tongue. | - |
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| apiculture | (noun) the cultivation of bees on a commercial scale for the production of honey | Synonyms: beekeeping |
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| apiculturist | (noun) a farmer who keeps bees for their honey | Synonyms: apiarist, beekeeper |
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| apishamore | (noun) a saddle blanket made of buffalo hide | - |
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| armpit | (noun) the hollow under the arm where it is joined to the shoulder | Synonyms: axilla, axillary cavity, axillary fossa |
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| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| aspic | (noun) savory jelly based on fish or meat stock used as a mold for meats or vegetables | - |
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| aspidistra | (noun) evergreen perennial with large handsome basal leaves; grown primarily as a foliage houseplant | Synonyms: Aspidistra elatio, bar-room plant, cast-iron plant |
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| aspirant | (noun) an ambitious and aspiring young person | Synonyms: aspirer, hopeful, wannabe, wannabee |
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| aspirate | (noun) a consonant pronounced with aspiration | - |
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| (noun) a speech sound having as an obvious concomitant an audible puff of breath, as initial stop consonants or initial h -sounds. | - |
| aspiration | (noun) the act of inhaling; the drawing in of air (or other gases) as in breathing | Synonyms: breathing in, inhalation, inspiration, intake |
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| (noun) a will to succeed | - |
| (noun) a manner of articulation involving an audible release of breath | - |
| (noun) a cherished desire | Synonyms: ambition, dream |
| aspirator | (noun) a pump that draws air or another gas through a liquid | - |
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| aspirer | (noun) an ambitious and aspiring young person | Synonyms: aspirant, hopeful, wannabe, wannabee |
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| aspirin | (noun) the acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer, Empirin, and St. Joseph) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets | Synonyms: acetylsalicylic acid, Bayer, Empirin, St. Joseph |
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| asthenopia | (noun) a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem | Synonyms: eyestrain |
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| atropine | (noun) a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides | - |
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| atypicality | (noun) any state that is not typical | Synonyms: untypicality |
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| auspice | (noun) a favorable omen | - |
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| auspices | (noun) kindly endorsement and guidance | Synonyms: aegis, protection |
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| auspiciousness | (noun) the favorable quality of strongly indicating a successful result | Synonyms: propitiousness |
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| australopithecine | (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
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| autopilot | (noun) a navigational device that automatically keeps ships or planes or spacecraft on a steady course | Synonyms: automatic pilot, robot pilot |
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| (noun) a cognitive state in which you act without self-awareness | Synonyms: automatic pilot |
| backspin | (noun) spin (usually of a moving ball) that retards or reverses the forward motion | - |
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| bagpipe | (noun) a tubular wind instrument; the player blows air into a bag and squeezes it out through the drone | - |
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| bagpiper | (noun) someone who plays the bagpipe | Synonyms: piper |
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| beekeeping | (noun) the cultivation of bees on a commercial scale for the production of honey | Synonyms: apiculture |
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| benzodiazepine | (noun) any of several similar lipophilic amines used as tranquilizers or sedatives or hypnotics or muscle relaxants; chronic use can lead to dependency | - |
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| bicuspid | (noun) a tooth having two cusps or points; located between the incisors and the molars | Synonyms: premolar |
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| biopiracy | (noun) biological theft; illegal collection of indigenous plants by corporations who patent them for their own use | - |
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| blacktopping | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktop |
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| blowpipe | (noun) a tube that directs air or gas into a flame to concentrate heat | Synonyms: blow tube, blowtube |
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| (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowgun, blowtube |
| bookkeeping | (noun) the activity of recording business transactions | Synonyms: clerking |
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| bpi | (noun) a measure of how densely information is packed on a storage medium | Synonyms: bits per inch |
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| breastpin | (noun) a decorative pin worn by women | Synonyms: broach, brooch |
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| bumpiness | (noun) the texture of a surface that has many bumps | - |
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| burping | (noun) a reflex that expels gas noisily from the stomach through the mouth | Synonyms: belch, belching, burp, eructation |
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| buspirone | (noun) a drug (trade name BuSpar) designed specifically for anxiety | Synonyms: BuSpar |
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| caipiblack | (noun) a variation of the Caipirinha made with black vodka instead of cachaça. | - |
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| camping | (noun) the act of encamping and living in tents in a camp | Synonyms: bivouacking, encampment, tenting |
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| campion | (noun) any plant of the genus Silene | Synonyms: catchfly, silene |
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| candlepin | (noun) a bowling pin that is thin by comparison with a tenpin | - |
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| candlepins | (noun) a bowling game using slender bowling pins | Synonyms: candlepin bowling |
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| capibara | (noun) pig-sized tailless South American amphibious rodent with partly webbed feet; largest living rodent | Synonyms: capybara, Hydrochoerus hydrochaeris |
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| capillarity | (noun) a phenomenon associated with surface tension and resulting in the elevation or depression of liquids in capillaries | Synonyms: capillary action |
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| capillary | (noun) a tube of small internal diameter; holds liquid by capillary action | Synonyms: capillary tube, capillary tubing |
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| (noun) any of the minute blood vessels connecting arterioles with venules | Synonyms: capillary vessel |
| capital | (noun) the upper part of a column that supports the entablature | Synonyms: cap, chapiter |
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| (noun) one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis | Synonyms: capital letter, majuscule, upper-case letter, uppercase |
| (noun) a seat of government | - |
| (noun) a center that is associated more than any other with some activity or product | - |
| (noun) wealth in the form of money or property owned by a person or business and human resources of economic value | - |
| (noun) assets available for use in the production of further assets | Synonyms: working capital |
| capitalisation | (noun) the act of capitalizing on an opportunity | Synonyms: capitalization |
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| (noun) the sale of capital stock | Synonyms: capitalization |
| (noun) an estimation of the value of a business | Synonyms: capitalization |
| (noun) writing in capital letters | Synonyms: capitalization |
| capitalism | (noun) an economic system based on private ownership of capital | Synonyms: capitalist economy |
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| capitalist | (noun) a person who invests capital in a business (especially a large business) | - |
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| (noun) a conservative advocate of capitalism | - |
| capitalization | (noun) the act of capitalizing on an opportunity | Synonyms: capitalisation |
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| (noun) the sale of capital stock | Synonyms: capitalisation |
| (noun) an estimation of the value of a business | Synonyms: capitalisation |
| (noun) writing in capital letters | Synonyms: capitalisation |
| capitate | (noun) the wrist bone with a rounded head shape that articulates with the 3rd metacarpus | Synonyms: capitate bone, os capitatum |
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| capitation | (noun) a tax levied on the basis of a fixed amount per person | - |
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| capitol | (noun) a building occupied by a state legislature | - |
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| capitula | (noun) a short scripture reading; done after a psalmody. | - |
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| capitulation | (noun) the act of surrendering (usually under agreed conditions) | Synonyms: fall, surrender |
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| (noun) a summary that enumerates the main parts of a topic | - |
| (noun) a document containing the terms of surrender | - |
| capitulum | (noun) a dense cluster of flowers or foliage | Synonyms: head |
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| (noun) fruiting spike of a cereal plant especially corn | Synonyms: ear, spike |
| (noun) an arrangement of leafy branches forming the top or head of a tree | - |
| capiz | (noun) marine bivalve common in Philippine coastal waters characterized by a large thin flat translucent shell | Synonyms: Placuna placenta, window oyster, windowpane oyster |
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| carping | (noun) persistent petty and unjustified criticism | Synonyms: faultfinding |
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| caterpillar | (noun) a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth | - |
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| cecropia | (noun) North American silkworm moth; larvae feed on the leaves of forest trees | Synonyms: cecropia moth, Hyalophora cecropia |
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| centerpiece | (noun) something placed at the center of something else (as on a table) | Synonyms: centrepiece |
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| (noun) the central or most important feature | Synonyms: centrepiece |
| centrepiece | (noun) something placed at the center of something else (as on a table) | Synonyms: centerpiece |
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| (noun) the central or most important feature | Synonyms: centerpiece |
| cephalaspid | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: osteostracan |
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| cesspit | (noun) a covered cistern; waste water and sewage flow into it | Synonyms: cesspool, sink, sump |
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| chalkpit | (noun) a quarry for chalk | Synonyms: chalk pit |
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| champion | (noun) someone who fights for a cause | Synonyms: fighter, hero, paladin |
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| (noun) someone who has won first place in a competition | Synonyms: champ, title-holder |
| (noun) a person who backs a politician or a team etc. | Synonyms: admirer, booster, friend, protagonist, supporter |
| (noun) someone who is dazzlingly skilled in any field | Synonyms: ace, adept, genius, hotshot, maven, mavin, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard |
| championship | (noun) the act of providing approval and support | Synonyms: backing, backup, patronage |
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| (noun) a competition at which a champion is chosen | - |
| (noun) the status of being a champion | Synonyms: title |
| chapiter | (noun) the upper part of a column that supports the entablature | Synonyms: cap, capital |
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| cheekpiece | (noun) either of two straps of a bridle that connect the bit to the headpiece | - |
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| chimneypiece | (noun) shelf that projects from wall above fireplace | Synonyms: mantel, mantelpiece, mantle, mantlepiece |
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| chincapin | (noun) small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut | Synonyms: chinkapin, chinquapin |
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| chinkapin | (noun) small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut | Synonyms: chincapin, chinquapin |
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| chinquapin | (noun) small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut | Synonyms: chincapin, chinkapin |
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| (noun) shrubby chestnut tree of southeastern United States having small edible nuts | Synonyms: Allegheny chinkapin, Castanea pumila, dwarf chestnut, eastern chinquapin |
| (noun) shrubby tree closely related to the Allegheny chinkapin but with larger leaves; southern midwestern United States | Synonyms: Castanea ozarkensis, Ozark chinkapin, Ozark chinquapin |
| chipping | (noun) the act of chipping something | Synonyms: chip, splintering |
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| chirpiness | (noun) cheerful and lively | - |
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| chloropicrin | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: nitrochloroform |
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| chomping | (noun) the act of chewing noisily | - |
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| chopine | (noun) a woman's shoe with a very high thick sole | Synonyms: platform |
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| choppiness | (noun) used of the sea during inclement or stormy weather | Synonyms: rough water, roughness |
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| chrysopid | (noun) pale green unpleasant-smelling lacewing fly having carnivorous larvae | Synonyms: green lacewing, stink fly |
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| clapping | (noun) a demonstration of approval by clapping the hands together | Synonyms: applause, hand clapping |
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| clipping | (noun) the act of clipping or snipping | Synonyms: clip, snip |
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| (noun) cutting down to the desired size or shape | Synonyms: trim, trimming |
| (noun) an excerpt cut from a newspaper or magazine | Synonyms: cutting, newspaper clipping, press clipping, press cutting |