| audiocassette | (noun) a cassette for audiotape | - |
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| authentication | (noun) validating the authenticity of something or someone | Synonyms: certification |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, hallmark |
| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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| avocado | (noun) a pear-shaped tropical fruit with green or blackish skin and rich yellowish pulp enclosing a single large seed | Synonyms: aguacate, alligator pear, avocado pear |
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| (noun) tropical American tree bearing large pulpy green fruits | Synonyms: avocado tree, Persea Americana |
| avocation | (noun) an auxiliary activity | Synonyms: by-line, hobby, pursuit, sideline, spare-time activity |
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| bacca | (noun) an indehiscent fruit derived from a single ovary having one or many seeds within a fleshy wall or pericarp: e.g. grape, tomato, cranberry | Synonyms: simple fruit |
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| baccalaureate | (noun) an academic degree conferred on someone who has successfully completed undergraduate studies | Synonyms: bachelor's degree |
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| (noun) a farewell sermon to a graduating class at their commencement ceremonies | - |
| baccarat | (noun) a card game played in casinos in which two or more punters gamble against the banker; the player wins who holds 2 or 3 cards that total closest to nine | Synonyms: chemin de fer |
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| ballistocardiogram | (noun) a graphical recording made by a ballistocardiograph | - |
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| ballistocardiograph | (noun) a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles | Synonyms: cardiograph |
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| barbacan | (noun) a tower that is part of a defensive structure (such as a castle) | Synonyms: barbican |
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| barbican | (noun) a tower that is part of a defensive structure (such as a castle) | Synonyms: barbacan |
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| barcarole | (noun) a boating song sung by Venetian gondoliers | Synonyms: barcarolle |
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| barcarolle | (noun) a boating song sung by Venetian gondoliers | Synonyms: barcarole |
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| barricade | (noun) a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc. | Synonyms: roadblock |
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| (noun) a barrier (usually thrown up hastily) to impede the advance of an enemy | - |
| basidiocarp | (noun) the fruiting body of a basidiomycete which bears its spores on special cells | - |
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| basilica | (noun) a Roman building used for public administration | Synonyms: Roman basilica |
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| (noun) an early Christian church designed like a Roman basilica; or a Roman Catholic church or cathedral accorded certain privileges | - |
| bathyscape | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscaph, bathyscaphe |
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| bathyscaph | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaphe |
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| bathyscaphe | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaph |
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| battercake | (noun) a flat cake of thin batter fried on both sides on a griddle | Synonyms: flannel-cake, flannel cake, flapcake, flapjack, griddlecake, hot cake, hotcake, pancake |
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| bearcat | (noun) arboreal civet of Asia having a long prehensile tail and shaggy black hair | Synonyms: Arctictis bintourong, binturong |
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| beatification | (noun) (Roman Catholic Church) an act of the Pope who declares that a deceased person lived a holy life and is worthy of public veneration; a first step toward canonization | - |
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| (noun) the action of rendering supremely blessed and extremely happy | - |
| (noun) a state of supreme happiness | Synonyms: beatitude, blessedness |
| beautification | (noun) the act of making something more beautiful | - |
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| beefcake | (noun) a photograph of a muscular man in minimal attire | - |
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| benzocaine | (noun) a white crystalline ester used as a local anesthetic | Synonyms: ethyl aminobenzoate |
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| bibliotheca | (noun) a collection of books | - |
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| bicarbonate | (noun) a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate | Synonyms: hydrogen carbonate |
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| bifocals | (noun) (plural) eyeglasses having two focal lengths, one for near vision and the other for far vision | - |
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| bifurcation | (noun) the act of splitting into two branches | - |
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| (noun) the place where something divides into two branches | - |
| (noun) a bifurcating branch (one or both of them) | - |
| bilocation | (noun) the ability (said of certain Roman Catholic saints) to exist simultaneously in two locations | - |
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| biocatalyst | (noun) a biochemical catalyst such as an enzyme | - |
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| birdcage | (noun) a cage in which a bird can be kept | - |
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| birdcall | (noun) a device for imitating a birdcall | - |
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| (noun) the characteristic sound produced by a bird | Synonyms: birdsong, call, song |
| blackcap | (noun) small brownish-grey warbler with a black crown | Synonyms: Silvia atricapilla |
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| (noun) chickadee having a dark crown | Synonyms: black-capped chickadee, Parus atricapillus |
| (noun) small black-headed European gull | Synonyms: Larus ridibundus, laughing gull, pewit, pewit gull |
| (noun) raspberry native to eastern North America having black thimble-shaped fruit | Synonyms: black raspberry, blackcap raspberry, Rubus occidentalis, thimbleberry |
| bobcat | (noun) small lynx of North America | Synonyms: bay lynx, Lynx rufus |
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| bookcase | (noun) a piece of furniture with shelves for storing books | - |
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| borosilicate | (noun) a salt of boric and silicic acids | - |
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| botanical | (noun) a drug made from part of a plant (as the bark or root or leaves) | - |
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| bottlecap | (noun) a cap that seals a bottle | - |
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| boxcar | (noun) a freight car with roof and sliding doors in the sides | - |
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| boxcars | (noun) (usually plural) an expression used when two dice are thrown and both come up showing six spots | - |
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| bradycardia | (noun) abnormally slow heartbeat | - |
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| braincase | (noun) the part of the skull that encloses the brain | Synonyms: brainpan, cranium |
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| bridecake | (noun) a rich cake with two or more tiers and covered with frosting and decorations; served at a wedding reception | Synonyms: wedding cake |
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| briefcase | (noun) a case with a handle; for carrying papers or files or books | - |
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| broadcast | (noun) message that is transmitted by radio or television | - |
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| (noun) a radio or television show | Synonyms: program, programme |
| broadcaster | (noun) a mechanical device for scattering something (seed or fertilizer or sand etc.) in all directions | Synonyms: spreader |
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| (noun) someone who broadcasts on radio or television | - |
| broadcasting | (noun) taking part in a radio or tv program | - |
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| (noun) a medium that disseminates via telecommunications | Synonyms: broadcast medium |
| brocade | (noun) thick heavy expensive material with a raised pattern | - |
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| buccaneer | (noun) someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation | Synonyms: pirate, sea robber, sea rover |
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| buccaneering | (noun) hijacking on the high seas or in similar contexts; taking a ship or plane away from the control of those who are legally entitled to it | Synonyms: piracy |
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| butacaine | (noun) a white crystalline ester that is applied to mucous membranes as a local anesthetic | Synonyms: butacaine sulfate |
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| bycatch | (noun) unwanted marine creatures that are caught in the nets while fishing for another species | Synonyms: by-catch |
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| cab | (noun) a car driven by a person whose job is to take passengers where they want to go in exchange for money | Synonyms: hack, taxi, taxicab |
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| (noun) small two-wheeled horse-drawn carriage; with two seats and a folding hood | Synonyms: cabriolet |
| (noun) a compartment at the front of a motor vehicle or locomotive where driver sits | - |
| cabal | (noun) a plot to carry out some harmful or illegal act (especially a political plot) | Synonyms: conspiracy |
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| (noun) a clique (often secret) that seeks power usually through intrigue | Synonyms: camarilla, faction, junto |
| cabala | (noun) an esoteric or occult matter resembling the Kabbalah that is traditionally secret | Synonyms: cabbala, cabbalah, kabala, kabbala, kabbalah, qabala, qabalah |
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| cabalism | (noun) adherence to some extreme traditional theological concept or interpretation | Synonyms: kabbalism |
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| cabalist | (noun) an expert who is highly skilled in obscure or difficult or esoteric matters | Synonyms: kabbalist |
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| (noun) a member of a cabal | - |
| cabana | (noun) a small tent used as a dressing room beside the sea or a swimming pool | - |
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| cabaret | (noun) a series of acts at a night club | Synonyms: floor show, floorshow |
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| (noun) a spot that is open late at night and that provides entertainment (as singers or dancers) as well as dancing and food and drink | Synonyms: club, night club, nightclub, nightspot |
| cabasset | (noun) a metal helmet worn by common soldiers in the 16th century | Synonyms: morion |
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| cabassous | (noun) naked-tailed armadillo of tropical South America | Synonyms: Cabassous unicinctus, tatouay |
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| cabbage | (noun) any of various types of cabbage | Synonyms: chou |
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| (noun) any of various cultivars of the genus Brassica oleracea grown for their edible leaves or flowers | Synonyms: Brassica oleracea, cultivated cabbage |
| (noun) informal terms for money | Synonyms: boodle, bread, clams, dinero, dough, gelt, kale, lettuce, lolly, loot, lucre, moolah, pelf, scratch, shekels, simoleons, sugar, wampum |
| cabbageworm | (noun) toxic green larva of a cabbage butterfly | Synonyms: Pieris rapae |
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| cabbala | (noun) an esoteric or occult matter resembling the Kabbalah that is traditionally secret | Synonyms: cabala, cabbalah, kabala, kabbala, kabbalah, qabala, qabalah |
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| cabbalah | (noun) an esoteric or occult matter resembling the Kabbalah that is traditionally secret | Synonyms: cabala, cabbala, kabala, kabbala, kabbalah, qabala, qabalah |
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| cabby | (noun) someone who drives a taxi for a living | Synonyms: cabdriver, cabman, hack-driver, hack driver, livery driver, taxidriver, taximan |
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| cabdriver | (noun) someone who drives a taxi for a living | Synonyms: cabby, cabman, hack-driver, hack driver, livery driver, taxidriver, taximan |
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| caber | (noun) a heavy wooden pole (such as the trunk of a young fir) that is tossed as a test of strength (in the Highlands of northern Scotland) | - |
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| cabin | (noun) the enclosed compartment of an aircraft or spacecraft where passengers are carried | - |
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| (noun) small room on a ship or boat where people sleep | - |
| (noun) a small house built of wood; usually in a wooded area | - |
| cabinet | (noun) a piece of furniture resembling a cupboard with doors and shelves and drawers; for storage or display | - |
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| (noun) housing for electronic instruments, as radio or television | Synonyms: console |
| (noun) a storage compartment for clothes and valuables; usually it has a lock | Synonyms: locker, storage locker |
| (noun) persons appointed by a head of state to head executive departments of government and act as official advisers | - |
| cabinetmaker | (noun) a woodworker who specializes in making furniture | Synonyms: furniture maker |
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| cabinetmaking | (noun) the craft of a joiner | Synonyms: joinery |
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| cabinetry | (noun) the craft of making furniture (especially furniture of high quality) | Synonyms: cabinetwork |
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| cabinetwork | (noun) the craft of making furniture (especially furniture of high quality) | Synonyms: cabinetry |
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| (noun) woodwork finished by hand by a cabinetmaker | - |
| cable | (noun) a very strong thick rope made of twisted hemp or steel wire | - |
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| (noun) a television system that transmits over cables | Synonyms: cable system, cable television, cable television service |
| (noun) a conductor for transmitting electrical or optical signals or electric power | Synonyms: line, transmission line |
| (noun) a telegram sent abroad | Synonyms: cablegram, overseas telegram |
| (noun) television that is transmitted over cable directly to the receiver | Synonyms: cable television |
| (noun) a nautical unit of depth | Synonyms: cable's length, cable length |
| cablegram | (noun) a telegram sent abroad | Synonyms: cable, overseas telegram |
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| cabman | (noun) someone who drives a taxi for a living | Synonyms: cabby, cabdriver, hack-driver, hack driver, livery driver, taxidriver, taximan |
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| cabochon | (noun) a highly polished gem that is cut convexly but without facets | - |
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| caboodle | (noun) any collection in its entirety | Synonyms: bunch, lot |
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| caboose | (noun) a car on a freight train for use of the train crew; usually the last car on the train | Synonyms: cabin car |
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| (noun) the area for food preparation on a ship | Synonyms: cookhouse, galley, ship's galley |
| cabotage | (noun) navigation in coastal waters | - |
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| (noun) the exclusive right of a country to control the air traffic within its borders | - |
| cabriolet | (noun) small two-wheeled horse-drawn carriage; with two seats and a folding hood | Synonyms: cab |
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| cabstand | (noun) a place where taxis park while awaiting customers | Synonyms: taxi rank, taxistand |
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| cacao | (noun) tropical American tree producing cacao beans | Synonyms: cacao tree, chocolate tree, Theobroma cacao |
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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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| cache | (noun) a hidden storage space (for money or provisions or weapons) | - |
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| (noun) (computer science) RAM memory that is set aside as a specialized buffer storage that is continually updated; used to optimize data transfers between system elements with different characteristics | Synonyms: memory cache |
| (noun) a secret store of valuables or money | Synonyms: hoard, stash |
| cachet | (noun) a seal on a letter | - |
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| (noun) an indication of approved or superior status | Synonyms: seal, seal of approval |
| (noun) a warrant formerly issued by a French king who could warrant imprisonment or death in a signed letter under his seal | Synonyms: lettre de cachet |
| cachexia | (noun) any general reduction in vitality and strength of body and mind resulting from a debilitating chronic disease | Synonyms: cachexy, wasting |
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| cachexy | (noun) any general reduction in vitality and strength of body and mind resulting from a debilitating chronic disease | Synonyms: cachexia, wasting |
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| cachinnation | (noun) loud convulsive laughter | - |
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| cachou | (noun) a scented lozenge used to sweeten the breath (e.g. to conceal the odor of tobacco) | - |
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| cacique | (noun) black-and-red or black-and-yellow orioles of the American tropics | Synonyms: cazique |
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| cackle | (noun) a loud laugh suggestive of a hen's cackle | - |
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| (noun) noisy talk | Synonyms: chatter, yack, yak, yakety-yak |
| (noun) the sound made by a hen after laying an egg | - |
| cackler | (noun) a hen that has just laid an egg and emits a shrill squawk | - |
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| (noun) any of various insectivorous Old World birds with a loud incessant song; in some classifications considered members of the family Muscicapidae | Synonyms: babbler |
| cacodaemon | (noun) an evil spirit | Synonyms: cacodemon |
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| cacodemon | (noun) an evil spirit | Synonyms: cacodaemon |
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| cacodyl | (noun) the univalent group derived from arsine | Synonyms: arsenic group, cacodyl group, cacodyl radical |
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| (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: tetramethyldiarsine |