| aeromechanics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aerodynamics |
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| antechamber | (noun) a large entrance or reception room or area | Synonyms: anteroom, entrance hall, foyer, hall, lobby, vestibule |
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| approachability | (noun) the attribute of being easy to meet or deal with | Synonyms: accessibility |
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| archaebacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacterium, archaeobacteria, archeobacteria |
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| archaebacterium | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaeobacteria, archeobacteria |
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| archaeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archeobacteria |
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| archaeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archeologist |
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| archaeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archeology |
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| archaeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: Archaeopteryx lithographica, archeopteryx |
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| archaeornis | (noun) extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing | - |
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| archaicism | (noun) the use of an archaic expression | Synonyms: archaism |
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| archaism | (noun) the use of an archaic expression | Synonyms: archaicism |
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| archaist | (noun) an expert or collector of antiquities | Synonyms: antiquarian, antiquary |
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| (noun) a person who archaizes | - |
| archangel | (noun) an angel ranked above the highest rank in the celestial hierarchy | - |
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| (noun) a biennial cultivated herb; its stems are candied and eaten and its roots are used medicinally | Synonyms: Angelica Archangelica, garden angelica |
| armchair | (noun) chair with a support on each side for arms | - |
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| bacchanal | (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanalia, debauch, debauchery, drunken revelry, orgy, riot, saturnalia |
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| (noun) someone who engages in drinking bouts | Synonyms: bacchant, drunken reveler, drunken reveller |
| (noun) a drunken reveller; a devotee of Bacchus | Synonyms: bacchant |
| bacchanalia | (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanal, debauch, debauchery, drunken revelry, orgy, riot, saturnalia |
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| bacchant | (noun) (classical mythology) a priest or votary of Bacchus | - |
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| (noun) a drunken reveller; a devotee of Bacchus | Synonyms: bacchanal |
| (noun) someone who engages in drinking bouts | Synonyms: bacchanal, drunken reveler, drunken reveller |
| bacchante | (noun) (classical mythology) a priestess or votary of Bacchus | - |
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| backchat | (noun) light teasing repartee | Synonyms: banter, give-and-take, raillery |
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| bechamel | (noun) milk thickened with a butter and flour roux | Synonyms: bechamel sauce, white sauce |
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| bedchamber | (noun) a room used primarily for sleeping | Synonyms: bedroom, chamber, sleeping accommodation, sleeping room |
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| cachalot | (noun) large whale with a large cavity in the head containing spermaceti and oil; also a source of ambergris | Synonyms: black whale, Physeter catodon, sperm whale |
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| carancha | (noun) South American caracara | Synonyms: Polyborus plancus |
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| catchall | (noun) an enclosure or receptacle for odds and ends | - |
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| chabasite | (noun) a group of minerals of the zeolite family consisting of a hydrous silicate of calcium and aluminum | Synonyms: chabazite |
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| chabazite | (noun) a group of minerals of the zeolite family consisting of a hydrous silicate of calcium and aluminum | Synonyms: chabasite |
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| chachalaca | (noun) slender arboreal guan resembling a wild turkey; native to Central America and Mexico; highly regarded as game birds | - |
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| chachka | (noun) (Yiddish) an inexpensive showy trinket | Synonyms: tchotchke, tsatske, tshatshke |
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| (noun) (Yiddish) an attractive, unconventional woman | Synonyms: tchotchke, tchotchkeleh, tsatske, tshatshke |
| chacma | (noun) greyish baboon of southern and eastern Africa | Synonyms: chacma baboon, Papio ursinus |
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| chad | (noun) a small piece of paper that is supposed to be removed when a hole is punched in a card or paper tape | - |
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| chadar | (noun) a cloth used as a head covering (and veil and shawl) by Muslim and Hindu women | Synonyms: chaddar, chador, chuddar |
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| chaddar | (noun) a cloth used as a head covering (and veil and shawl) by Muslim and Hindu women | Synonyms: chadar, chador, chuddar |
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| chadlock | (noun) weedy Eurasian plant often a pest in grain fields | Synonyms: Brassica kaber, charlock, field mustard, Sinapis arvensis, wild mustard |
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| chador | (noun) a cloth used as a head covering (and veil and shawl) by Muslim and Hindu women | Synonyms: chadar, chaddar, chuddar |
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| chaenactis | (noun) any of several United States plants having long stalks of funnel-shaped white or yellow flowers | - |
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| chaeta | (noun) a stiff chitinous seta or bristle especially of an annelid worm | - |
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| chaetodon | (noun) any fish of the genus Chaetodon | - |
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| chaetognath | (noun) any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth | Synonyms: arrowworm |
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| chafe | (noun) anger produced by some annoying irritation | Synonyms: annoyance, vexation |
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| (noun) soreness and warmth caused by friction | - |
| chafeweed | (noun) weedy perennial of north temperate regions having woolly foliage and dirty white flowers in a leafy spike | Synonyms: Gnaphalium sylvaticum, wood cudweed |
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| chaff | (noun) foil in thin strips; ejected into the air as a radar countermeasure | - |
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| (noun) material consisting of seed coverings and small pieces of stem or leaves that have been separated from the seeds | Synonyms: husk, shuck, stalk, straw, stubble |
| chaffinch | (noun) small European finch with a cheerful song | Synonyms: Fringilla coelebs |
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| chaffweed | (noun) weedy plant having short dry chafflike leaves | Synonyms: bastard pimpernel, false pimpernel |
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| chafing | (noun) soreness or irritation of the skin caused by friction | - |
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| chagrin | (noun) strong feelings of embarrassment | Synonyms: humiliation, mortification |
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| chain | (noun) a series of (usually metal) rings or links fitted into one another to make a flexible ligament | - |
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| (noun) a necklace made by stringing objects together | Synonyms: strand, string |
| (noun) anything that acts as a restraint | - |
| (noun) a linked or connected series of objects | - |
| (noun) a series of things depending on each other as if linked together | Synonyms: concatenation |
| (noun) (business) a number of similar establishments (stores or restaurants or banks or hotels or theaters) under one ownership | - |
| (noun) (chemistry) a series of linked atoms (generally in an organic molecule) | Synonyms: chemical chain |
| (noun) a series of hills or mountains | Synonyms: chain of mountains, mountain chain, mountain range, range, range of mountains |
| (noun) a unit of length | - |
| chains | (noun) metal shackles; for hands or legs | Synonyms: irons |
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| chainsaw | (noun) portable power saw; teeth linked to form an endless chain | Synonyms: chain saw |
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| chair | (noun) the position of professor | Synonyms: professorship |
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| (noun) a seat for one person, with a support for the back | - |
| (noun) an instrument of execution by electrocution; resembles an ordinary seat for one person | Synonyms: death chair, electric chair, hot seat |
| (noun) a particular seat in an orchestra | - |
| (noun) the officer who presides at the meetings of an organization | Synonyms: chairperson, president |
| chairlift | (noun) a ski lift on which riders (skiers or sightseers) are seated and carried up or down a mountainside; seats are hung from an endless overhead cable | Synonyms: chair lift |
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| chairman | (noun) the male officer who presides at the meetings of an organization | - |
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| chairmanship | (noun) the position of chairman | - |
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| chairperson | (noun) the officer who presides at the meetings of an organization | Synonyms: chair, president |
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| chairwoman | (noun) the female officer who presides at the meetings of an organization | - |
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| chaise | (noun) a carriage consisting of two wheels and a calash top; drawn by a single horse | Synonyms: shay |
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| (noun) a long chair; for reclining | Synonyms: chaise longue, daybed |
| chaja | (noun) largest crested screamer; native to southern Brazil and Argentina | Synonyms: Chauna torquata |
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| chalaza | (noun) one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell | - |
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| (noun) basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined | - |
| chalazion | (noun) a small sebaceous cyst of the eyelid resulting when a Meibomian gland is blocked | Synonyms: Meibomian cyst |
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| chalcanthite | (noun) hydrated blue crystalline form of copper sulfate | Synonyms: blue copperas, blue stone, blue vitriol |
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| chalcedony | (noun) a milky or greyish translucent to transparent quartz | Synonyms: calcedony |
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| chalcid | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid fly, chalcid wasp, chalcidfly |
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| chalcidfly | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid, chalcid fly, chalcid wasp |
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| chalcocite | (noun) a heavy grey mineral that is an ore of copper | Synonyms: copper glance |
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| chalcopyrite | (noun) a yellow copper ore (CuFeS2) made up of copper and iron sulfide | Synonyms: copper pyrites |
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| chaldron | (noun) a British imperial capacity measure (liquid or dry) equal to 36 bushels | - |
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| chalet | (noun) a Swiss house with a sloping roof and wide eaves or a house built in this style | - |
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| chalice | (noun) a bowl-shaped drinking vessel; especially the Eucharistic cup | Synonyms: goblet |
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| chalk | (noun) a piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces | - |
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| (noun) an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant | Synonyms: chicken feed, crank, deoxyephedrine, glass, ice, meth, methamphetamine, methamphetamine hydrochloride, Methedrine, shabu, trash |
| (noun) a pure flat white with little reflectance | - |
| (noun) a soft whitish calcite | - |
| chalkboard | (noun) sheet of slate; for writing with chalk | Synonyms: blackboard |
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| chalkpit | (noun) a quarry for chalk | Synonyms: chalk pit |
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| chalkstone | (noun) a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout | Synonyms: tophus |
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| challah | (noun) (Judaism) a loaf of white bread containing eggs and leavened with yeast; often formed into braided loaves and glazed with eggs before baking | Synonyms: hallah |
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| challenge | (noun) a call to engage in a contest or fight | - |
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| (noun) questioning a statement and demanding an explanation | - |
| (noun) a formal objection to the selection of a particular person as a juror | - |
| (noun) a demand by a sentry for a password or identification | - |
| (noun) a demanding or stimulating situation | - |
| challenger | (noun) the contestant you hope to defeat | Synonyms: competition, competitor, contender, rival |
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| challis | (noun) a soft lightweight fabric (usually printed) | - |
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| chalybite | (noun) iron ore in the form of ferrous carbonate | Synonyms: siderite |
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| chamaeleon | (noun) lizard of Africa and Madagascar able to change skin color and having a projectile tongue | Synonyms: chameleon |
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| chamarre | (noun) a fur-lined coat decorated with braid, worn in the sixteenth century. | Synonyms: chimer, simarre |
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| chamber | (noun) a natural or artificial enclosed space | - |
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| (noun) a room used primarily for sleeping | Synonyms: bedchamber, bedroom, sleeping accommodation, sleeping room |
| (noun) a room where a judge transacts business | - |
| (noun) an enclosed volume in the body | - |
| (noun) a deliberative or legislative or administrative or judicial assembly | - |
| chamberlain | (noun) the treasurer of a municipal corporation | - |
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| (noun) an officer who manages the household of a king or nobleman | - |
| chambermaid | (noun) a maid who is employed to clean and care for bedrooms (now primarily in hotels) | Synonyms: fille de chambre |
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| chamberpot | (noun) a receptacle for urination or defecation in the bedroom | Synonyms: potty, thunder mug |
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| chambray | (noun) a lightweight fabric woven with white threads across a colored warp | - |
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| chameleon | (noun) lizard of Africa and Madagascar able to change skin color and having a projectile tongue | Synonyms: chamaeleon |
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| (noun) a changeable or inconstant person | - |
| chamfer | (noun) two surfaces meeting at an angle different from 90 degrees | Synonyms: bevel, cant |
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| chamfron | (noun) medieval plate armor to protect a horse's head | Synonyms: chanfron, front-stall, frontstall, testiere |
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| chammy | (noun) a soft suede leather formerly from the skin of the chamois antelope but now from sheepskin | Synonyms: chammy leather, chamois, chamois leather, shammy, shammy leather |
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| chamois | (noun) hoofed mammal of mountains of Eurasia having upright horns with backward-hooked tips | Synonyms: Rupicapra rupicapra |
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| (noun) a soft suede leather formerly from the skin of the chamois antelope but now from sheepskin | Synonyms: chammy, chammy leather, chamois leather, shammy, shammy leather |
| chamomile | (noun) Eurasian plant with apple-scented foliage and white-rayed flowers and feathery leaves used medicinally; in some classification systems placed in genus Anthemis | Synonyms: Anthemis nobilis, camomile, Chamaemelum nobilis |
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| chamosite | (noun) a greenish grey or black silicate of iron and aluminum | - |
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| champ | (noun) someone who has won first place in a competition | Synonyms: champion, title-holder |
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| champagne | (noun) a white sparkling wine either produced in Champagne or resembling that produced there | Synonyms: bubbly |
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| champaign | (noun) extensive tract of level open land | Synonyms: field, plain |
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| champerty | (noun) an unethical agreement between an attorney and client that the attorney would sue and pay the costs of the client's suit in return for a portion of the damages awarded | - |
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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 |
| chanal | (noun) thorny shrub or small tree common in central Argentina having small orange or yellow flowers followed by edible berries | Synonyms: chanar, Geoffroea decorticans |
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| chanar | (noun) thorny shrub or small tree common in central Argentina having small orange or yellow flowers followed by edible berries | Synonyms: chanal, Geoffroea decorticans |
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| chance | (noun) a risk involving danger | - |
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| (noun) a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible | Synonyms: probability |
| (noun) an unknown and unpredictable phenomenon that causes an event to result one way rather than another | Synonyms: fortune, hazard, luck |
| (noun) a possibility due to a favorable combination of circumstances | Synonyms: opportunity |
| (noun) the possibility of future success | Synonyms: prospect |