| acroanaesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanesthesia |
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| acroanesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanaesthesia |
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| actinozoan | (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed | Synonyms: anthozoan |
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| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
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| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
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| aminoalkane | (noun) a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals | Synonyms: amine |
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| anoa | (noun) small buffalo of the Celebes having small straight horns | Synonyms: Anoa depressicornis, dwarf buffalo |
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| anthozoan | (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed | Synonyms: actinozoan |
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| anticoagulant | (noun) medicine that prevents or retards the clotting of blood | Synonyms: anticoagulant medication, decoagulant |
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| anticoagulation | (noun) the administration of an anticoagulant drug to retard coagulation of the blood | - |
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| antiprotozoal | (noun) a medicinal drug used to fight diseases (like malaria) that are caused by protozoa | Synonyms: antiprotozoal drug |
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| apoapsis | (noun) (astronomy) the point in an orbit farthest from the body being orbited | Synonyms: point of apoapsis |
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| approach | (noun) the act of drawing spatially closer to something | Synonyms: approaching, coming |
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| (noun) a relatively short golf shot intended to put the ball onto the putting green | Synonyms: approach shot |
| (noun) ideas or actions intended to deal with a problem or situation | Synonyms: attack, plan of attack |
| (noun) a way of entering or leaving | Synonyms: access |
| (noun) the temporal property of becoming nearer in time | Synonyms: approaching, coming |
| (noun) a close approximation | - |
| (noun) a tentative suggestion designed to elicit the reactions of others | Synonyms: advance, feeler, overture |
| (noun) the event of one object coming closer to another | Synonyms: approaching |
| (noun) the final path followed by an aircraft as it is landing | Synonyms: approach path, glide path, glide slope |
| approachability | (noun) the attribute of being easy to meet or deal with | Synonyms: accessibility |
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| approaching | (noun) the act of drawing spatially closer to something | Synonyms: approach, coming |
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| (noun) the temporal property of becoming nearer in time | Synonyms: approach, coming |
| (noun) the event of one object coming closer to another | Synonyms: approach |
| autoalarm | (noun) a radio receiving device used on ships that rings an alarm bell when a distress signal is received. | Synonyms: auto-alarm |
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| autoantibody | (noun) an antibody acting against tissues of the organism that produces it | - |
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| autoloader | (noun) a firearm that reloads itself | Synonyms: self-loader |
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| backboard | (noun) a board used to support the back of someone or something | - |
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| (noun) a raised vertical board with basket attached; used to play basketball | Synonyms: basketball backboard |
| balboa | (noun) the basic unit of money in Panama; equal to 100 centesimos | - |
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| bareboat | (noun) a vessel (such as a yacht) that can be chartered without a captain or crew or provisions | - |
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| bareboating | (noun) boating by chartering a bareboat and providing your own crew and provisions | - |
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| baseboard | (noun) a molding covering the joint formed by a wall and the floor | Synonyms: mopboard, skirting board |
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| benzoate | (noun) any salt or ester of benzoic acid | - |
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| billboard | (noun) large outdoor signboard | Synonyms: hoarding |
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| bioarm | (noun) any weapon usable in biological warfare | Synonyms: biological weapon, bioweapon |
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| bioassay | (noun) appraisal of the biological activity of a substance by testing its effect on an organism and comparing the result with some agreed standard | Synonyms: bio-assay |
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| bioattack | (noun) the use of bacteria or viruses or toxins to destroy men and animals or food | Synonyms: biologic attack, biological attack, biological warfare, BW |
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| blackboard | (noun) sheet of slate; for writing with chalk | Synonyms: chalkboard |
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| bloat | (noun) swelling of the rumen or intestinal tract of domestic animals caused by excessive gas | - |
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| bloater | (noun) large fatty herring lightly salted and briefly smoked | - |
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| bluecoat | (noun) a person dressed all in blue (as a soldier or sailor) | - |
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| bluethroat | (noun) songbird of northern Europe and Asia | Synonyms: Erithacus svecicus |
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| boa | (noun) any of several chiefly tropical constrictors with vestigial hind limbs | - |
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| (noun) a long thin fluffy scarf of feathers or fur | Synonyms: feather boa |
| boar | (noun) an uncastrated male hog | - |
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| (noun) Old World wild swine having a narrow body and prominent tusks from which most domestic swine come; introduced in United States | Synonyms: Sus scrofa, wild boar |
| board | (noun) a flat piece of material designed for a special purpose | - |
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| (noun) a table at which meals are served | Synonyms: dining table |
| (noun) electrical device consisting of a flat insulated surface that contains switches and dials and meters for controlling other electrical devices | Synonyms: control board, control panel, instrument panel, panel |
| (noun) a vertical surface on which information can be displayed to public view | Synonyms: display board, display panel |
| (noun) a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities | Synonyms: add-in, card, circuit board, circuit card, plug-in |
| (noun) a flat portable surface (usually rectangular) designed for board games | Synonyms: gameboard |
| (noun) food or meals in general | Synonyms: table |
| (noun) a committee having supervisory powers | - |
| (noun) a stout length of sawn timber; made in a wide variety of sizes and used for many purposes | Synonyms: plank |
| boarder | (noun) a tenant in someone's house | Synonyms: lodger, roomer |
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| (noun) a pupil who lives at school during term time | - |
| (noun) someone who forces their way aboard ship | - |
| boarding | (noun) the act of passengers and crew getting aboard a ship or aircraft | Synonyms: embarkation, embarkment |
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| (noun) a structure of boards | - |
| boardinghouse | (noun) a private house that provides accommodations and meals for paying guests | Synonyms: boarding house |
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| boardroom | (noun) a room where a committee meets (such as the board of directors of a company) | Synonyms: council chamber |
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| boards | (noun) (used in the plural) the boarding that surrounds an ice hockey rink | - |
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| (noun) (used in the plural) the stage of a theater | - |
| boardwalk | (noun) a walkway made of wooden boards; usually at seaside | - |
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| boarfish | (noun) fish with a projecting snout | Synonyms: Capros aper |
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| (noun) fish with large eyes and long snouts | - |
| boarhound | (noun) large hound used in hunting wild boars | - |
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| boast | (noun) speaking of yourself in superlatives | Synonyms: boasting, jactitation, self-praise |
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| boaster | (noun) a very boastful and talkative person | Synonyms: blowhard, braggart, bragger, line-shooter, vaunter |
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| boastfulness | (noun) outspoken conceit | Synonyms: vainglory |
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| boasting | (noun) speaking of yourself in superlatives | Synonyms: boast, jactitation, self-praise |
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| boat | (noun) a small vessel for travel on water | - |
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| (noun) a dish (often boat-shaped) for serving gravy or sauce | Synonyms: gravy boat, gravy holder, sauceboat |
| boatbill | (noun) tropical American heron related to night herons | Synonyms: boat-billed heron, broadbill, Cochlearius cochlearius |
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| boatbuilder | (noun) a person who builds boats | - |
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| boater | (noun) a stiff hat made of straw with a flat crown | Synonyms: leghorn, Panama, Panama hat, sailor, skimmer, straw hat |
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| (noun) someone who drives or rides in a boat | Synonyms: boatman, waterman |
| boathouse | (noun) a shed at the edge of a river or lake; used to store boats | - |
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| boating | (noun) water travel for pleasure | Synonyms: yachting |
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| boatload | (noun) the amount of cargo that can be held by a boat or ship or a freight car | Synonyms: carload, shipload |
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| boatman | (noun) someone who drives or rides in a boat | Synonyms: boater, waterman |
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| boatmanship | (noun) skill in handling boats | - |
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| boatswain | (noun) a petty officer on a merchant ship who controls the work of other seamen | Synonyms: bo's'n, bo'sun, bos'n, bosun |
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| boatyard | (noun) a place where boats are built or maintained or stored | - |
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| bobfloat | (noun) a small float usually made of cork; attached to a fishing line | Synonyms: bob, bobber, cork |
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| breadboard | (noun) a wooden or plastic board on which dough is kneaded or bread is sliced | Synonyms: bread board |
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| breechloader | (noun) a gun that is loaded at the breech | - |
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| broach | (noun) a decorative pin worn by women | Synonyms: breastpin, brooch |
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| broad | (noun) slang term for a woman | - |
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| broadax | (noun) a large ax with a broad cutting blade | Synonyms: broadaxe |
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| broadaxe | (noun) a large ax with a broad cutting blade | Synonyms: broadax |
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| broadbill | (noun) small birds of the Old World tropics having bright plumage and short wide bills | - |
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| (noun) freshwater duck of the Northern Hemisphere having a broad flat bill | Synonyms: Anas clypeata, shoveler, shoveller |
| (noun) diving ducks of North America having a bluish-grey bill | Synonyms: bluebill, scaup, scaup duck |
| (noun) tropical American heron related to night herons | Synonyms: boat-billed heron, boatbill, Cochlearius cochlearius |
| 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 |
| broadcloth | (noun) a closely woven silk or synthetic fabric with a narrow crosswise rib | - |
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| (noun) a densely textured woolen fabric with a lustrous finish | - |
| broadening | (noun) the action of making broader | - |
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| (noun) the act of making something wider | Synonyms: widening |
| (noun) an increase in width | Synonyms: widening |
| broadloom | (noun) a carpet woven on a wide loom to obviate the need for seams | - |
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| broadness | (noun) the property of being wide; having great width | Synonyms: wideness |
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| broadsheet | (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadside, circular, flier, flyer, handbill, throwaway |
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| broadside | (noun) the simultaneous firing of all the armament on one side of a warship | - |
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| (noun) the whole side of a vessel from stem to stern | - |
| (noun) all of the armament that is fired from one side of a warship | - |
| (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, circular, flier, flyer, handbill, throwaway |
| (noun) a speech of violent denunciation | Synonyms: philippic, tirade |
| broadsword | (noun) a sword with a broad blade and (usually) two cutting edges; used to cut rather than stab | - |
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| broadtail | (noun) hardy coarse-haired sheep of central Asia; lambs are valued for their soft curly black fur | Synonyms: caracul, karakul |
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| (noun) the fur of a very young karakul lamb | - |
| bryozoan | (noun) sessile aquatic animal forming mossy colonies of small polyps each having a curved or circular ridge bearing tentacles; attach to stones or seaweed and reproduce by budding | Synonyms: moss animal, polyzoan, sea mat, sea moss |
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| buckboard | (noun) an open horse-drawn carriage with four wheels; has a seat attached to a flexible board between the two axles | - |
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| bumboat | (noun) a small boat that ferries supplies and commodities for sale to a larger ship at anchor | - |
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| busload | (noun) the quantity of cargo or the number of passengers that a bus can carry | - |
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| byroad | (noun) a side road little traveled (as in the countryside) | Synonyms: bypath, byway |
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| cardboard | (noun) a stiff moderately thick paper | Synonyms: composition board |
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| carload | (noun) a gathering of passengers sufficient to fill an automobile | - |
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| (noun) the amount of cargo that can be held by a boat or ship or a freight car | Synonyms: boatload, shipload |
| cartload | (noun) the quantity that a cart holds | - |
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| cartroad | (noun) any road or path affording passage especially a rough one | Synonyms: cart track, track |
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| catboat | (noun) a sailboat with a single mast set far forward | - |
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| centerboard | (noun) a retractable fin keel used on sailboats to prevent drifting to leeward | Synonyms: centreboard, drop keel, sliding keel |
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| centreboard | (noun) a retractable fin keel used on sailboats to prevent drifting to leeward | Synonyms: centerboard, drop keel, sliding keel |
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| chalkboard | (noun) sheet of slate; for writing with chalk | Synonyms: blackboard |
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| charcoal | (noun) a stick of black carbon material used for drawing | Synonyms: fusain |
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| (noun) a drawing made with a stick of black carbon material | - |
| (noun) a very dark grey color | Synonyms: charcoal gray, charcoal grey, oxford gray, oxford grey |
| (noun) a carbonaceous material obtained by heating wood or other organic matter in the absence of air | Synonyms: wood coal |
| checkerboard | (noun) a board having 64 squares of two alternating colors | Synonyms: checker board, chequerboard |
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| cheeseboard | (noun) tray on which cheeses are served | Synonyms: cheese tray |
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| chemoattractant | (noun) a substance inducing positive chemotaxis in motile cells. | - |
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| chemoautotroph | (noun) An organism that depends on chemicals for its energy and principally on carbon dioxide for its carbon. | Synonyms: chemotrophic autotroph |
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| chequerboard | (noun) a board having 64 squares of two alternating colors | Synonyms: checker board, checkerboard |
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| chessboard | (noun) a checkerboard used to play chess | Synonyms: chess board |
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| chipboard | (noun) a cheap hard material made from wood chips that are pressed together and bound with synthetic resin | Synonyms: hardboard |
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| chloasma | (noun) a tan discoloration of a woman's face that is associated with pregnancy or with the use of oral contraceptives | Synonyms: mask of pregnancy, melasma |
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