| aeromechanic | (adjective) of or pertaining to aerodynamics | - |
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| 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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| approachable | (adjective) easy to meet or converse or do business with | - |
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| (adjective) easily approached | Synonyms: reachable |
| (adjective) capable of being read with comprehension | Synonyms: accessible |
| archaean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archean |
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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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| archaeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeological, archeologic, archeological |
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| archaeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archeologic, archeological |
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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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| archaeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archeozoic |
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| archaic | (adjective) little evolved from or characteristic of an earlier ancestral type | Synonyms: primitive |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antediluvian, antiquated |
| archaicism | (noun) the use of an archaic expression | Synonyms: archaism |
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| archaise | (verb) give an archaic appearance of character to | Synonyms: archaize |
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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 | - |
| archaistic | (adjective) imitative of an archaic style or manner | - |
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| archaize | (verb) give an archaic appearance of character to | Synonyms: archaise |
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| 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 |
| archangelic | (adjective) of or relating to or resembling archangels | Synonyms: archangelical |
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| archangelical | (adjective) of or relating to or resembling archangels | Synonyms: archangelic |
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| armchair | (noun) chair with a support on each side for arms | - |
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| attachable | (adjective) capable of being fastened or added to something else | - |
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| bacchanal | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanalian, bacchic, carousing, orgiastic |
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| (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanalia, debauch, debauchery, drunken revelry, orgy, riot, saturnalia |
| (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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| bacchanalian | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchic, carousing, orgiastic |
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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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| bacchantic | (adjective) of or relating to or resembling a bacchanalian reveler | - |
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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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| bechance | (verb) happen, occur, or be the case in the course of events or by chance | Synonyms: befall, happen |
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| (verb) become of; happen to | Synonyms: befall, betide |
| becharm | (verb) attract; cause to be enamored | Synonyms: beguile, bewitch, captivate, capture, catch, charm, enamor, enamour, enchant, entrance, fascinate, trance |
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| (verb) control by magic spells, as by practicing witchcraft | Synonyms: charm |
| 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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| chaetal | (adjective) of or relating to chaetae (setae or bristles) | - |
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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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| chaetognathan | (adjective) of or relating to arrowworms | Synonyms: chaetognathous |
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| chaetognathous | (adjective) of or relating to arrowworms | Synonyms: chaetognathan |
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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 | - |
| (verb) warm by rubbing, as with the hands | - |
| (verb) tear or wear off the skin or make sore by abrading | Synonyms: excoriate |
| (verb) cause friction | Synonyms: fray, fret, rub, scratch |
| (verb) cause annoyance in; disturb, especially by minor irritations | Synonyms: annoy, bother, devil, get at, get to, gravel, irritate, nark, nettle, rag, rile, vex |
| (verb) feel extreme irritation or anger | - |
| (verb) become or make sore by or as if by rubbing | Synonyms: fret, gall |
| chafed | (adjective) painful from having the skin abraded | Synonyms: galled |
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| 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 |
| (verb) be silly or tease one another | Synonyms: banter, jolly, josh, kid |
| chaffer | (verb) talk socially without exchanging too much information | Synonyms: chat, chatter, chew the fat, chit-chat, chitchat, claver, confab, confabulate, gossip, jaw, natter, shoot the breeze, visit |
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| (verb) wrangle (over a price, terms of an agreement, etc.) | Synonyms: haggle, higgle, huckster |
| chaffinch | (noun) small European finch with a cheerful song | Synonyms: Fringilla coelebs |
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| chafflike | (adjective) abounding in or covered with or resembling or consisting of chaff | Synonyms: chaffy |
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| chaffweed | (noun) weedy plant having short dry chafflike leaves | Synonyms: bastard pimpernel, false pimpernel |
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| chaffy | (adjective) abounding in or covered with or resembling or consisting of chaff | Synonyms: chafflike |
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| (adjective) value | - |
| 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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| (verb) cause to feel shame; hurt the pride of | Synonyms: abase, humble, humiliate, mortify |
| chagrined | (adjective) feeling or caused to feel ill at ease or self-conscious or ashamed | Synonyms: abashed, embarrassed |
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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 | - |
| (verb) fasten or secure with chains | - |
| (verb) connect or arrange into a chain by linking | - |
| chained | (adjective) bound with chains | Synonyms: enchained, in chains |
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| chainlike | (adjective) having a chainlike form | Synonyms: catenulate |
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| 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 |
| (verb) preside over | Synonyms: lead, moderate |
| (verb) act or preside as chair, as of an academic department in a university | Synonyms: chairman |
| 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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| (verb) act or preside as chair, as of an academic department in a university | Synonyms: chair |
| 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 | - |
| (verb) write, draw, or trace with chalk | - |
| 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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| chalky | (adjective) composed of or containing or resembling calcium carbonate or calcite or chalk | Synonyms: calcareous |
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| (adjective) of something having the color of chalk | - |