| aboard | (adverb) on first or second or third base | - |
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| (adverb) on a ship, train, plane or other vehicle | Synonyms: on board |
| (adverb) part of a group | - |
| (adverb) side by side | Synonyms: alongside |
| aboveboard | (adjective) without concealment or deception; honest | Synonyms: straightforward |
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| (adverb) in an honest manner | Synonyms: honestly |
| abroach | (adjective) of a cask or barrel | Synonyms: broached |
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| abroad | (adjective) in a foreign country | Synonyms: overseas |
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| (adverb) to or in a foreign country | - |
| (adverb) in a place across an ocean | Synonyms: overseas |
| (adverb) far away from home or one's usual surroundings | Synonyms: afield |
| 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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| afloat | (adjective) borne on the water; floating | - |
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| (adjective) covered with water | Synonyms: awash, flooded, inundated, overflowing |
| (adjective) aimlessly drifting | Synonyms: adrift, aimless, directionless, planless, rudderless, undirected |
| 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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| anticoagulative | (adjective) of or relating to an anticoagulant | - |
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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 |
| (verb) make advances to someone, usually with a proposal or suggestion | - |
| (verb) move towards | Synonyms: come near, come on, draw close, draw near, go up, near |
| (verb) come near in time | Synonyms: come near |
| (verb) begin to deal with | Synonyms: go about, set about |
| (verb) come near or verge on, resemble, come nearer in quality, or character | Synonyms: border on |
| 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 |
| approaching | (adjective) of the relatively near future | Synonyms: coming, forthcoming, upcoming |
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| (noun) the act of drawing spatially closer to something | Synonyms: approach, coming |
| (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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| autoloading | (adjective) (of firearms) capable of automatic loading and firing continuously | Synonyms: self-loading, semiautomatic |
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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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| bemoan | (verb) regret strongly | Synonyms: bewail, deplore, lament |
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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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| (verb) subject to a bio-assay | - |
| 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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| (verb) become bloated or swollen or puff up | - |
| (verb) make bloated or swollen | - |
| bloated | (adjective) abnormally distended especially by fluids or gas | Synonyms: distended, intumescent, puffy, swollen, tumescent, tumid, turgid |
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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 |
| (verb) provide food and lodging (for) | - |
| (verb) lodge and take meals (at) | - |
| (verb) get on board of (trains, buses, ships, aircraft, etc.) | Synonyms: get on |
| (verb) live and take one's meals at or in | Synonyms: room |
| 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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| (verb) show off | Synonyms: blow, bluster, brag, gas, gasconade, shoot a line, swash, tout, vaunt |
| (verb) wear or display in an ostentatious or proud manner | Synonyms: feature, sport |
| boaster | (noun) a very boastful and talkative person | Synonyms: blowhard, braggart, bragger, line-shooter, vaunter |
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| boastful | (adjective) exhibiting self-importance | Synonyms: big, braggart, bragging, braggy, cock-a-hoop, crowing, self-aggrandising, self-aggrandizing |
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| boastfully | (adverb) in a boastful manner | Synonyms: big, large, vauntingly |
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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 |
| (verb) ride in a boat on water | - |
| 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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| (verb) bring up a topic for discussion | Synonyms: initiate |
| broached | (adjective) of a cask or barrel | Synonyms: abroach |
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| broad | (adjective) having great (or a certain) extent from one side to the other | Synonyms: wide |
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| (adjective) showing or characterized by broad-mindedness | Synonyms: large-minded, liberal, tolerant |
| (adjective) lacking subtlety; obvious | Synonyms: unsubtle |
| (adjective) broad in scope or content | Synonyms: across-the-board, all-embracing, all-encompassing, all-inclusive, blanket, encompassing, extensive, panoptic, wide |
| (adjective) not detailed or specific | Synonyms: unspecific |
| (adjective) being at a peak or culminating point | Synonyms: full |
| (adjective) very large in expanse or scope | Synonyms: spacious, wide |
| (adjective) (of speech) heavily and noticeably regional | - |
| (noun) slang term for a woman | - |
| 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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| broadband | (adjective) responding to or operating at a wide band of frequencies | Synonyms: wideband |
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| (adjective) of or relating to or being a communications network in which the bandwidth can be divided and shared by multiple simultaneous signals (as for voice or data or video) | - |
| 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 |
| (verb) cause to become widely known | Synonyms: circularise, circularize, circulate, diffuse, disperse, disseminate, distribute, pass around, propagate, spread |
| (verb) broadcast over the airwaves, as in radio or television | Synonyms: air, beam, send, transmit |
| (verb) sow over a wide area, especially by hand | - |
| 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 | - |
| broaden | (verb) become broader | - |
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| (verb) make broader | - |
| (verb) extend in scope or range or area | Synonyms: extend, widen |
| (verb) vary in order to spread risk or to expand | Synonyms: branch out, diversify |
| 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 |
| broadleaf | (adjective) having relatively broad rather than needlelike or scalelike leaves | Synonyms: broad-leafed, broad-leaved |
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| broadloom | (adjective) (of rugs or carpets) woven full width | - |
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| (noun) a carpet woven on a wide loom to obviate the need for seams | - |
| broadly | (adverb) without regard to specific details or exceptions | Synonyms: broadly speaking, generally, loosely |
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| (adverb) in a wide fashion | - |
| broadness | (noun) the property of being wide; having great width | Synonyms: wideness |
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| broadnosed | (adjective) of or related to New World monkeys having nostrils far apart or to people with broad noses | Synonyms: platyrhine, platyrhinian, platyrrhine, platyrrhinian, platyrrhinic |
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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 | (adjective) toward a full side | - |
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| (noun) the simultaneous firing of all the armament on one side of a warship | - |
| (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 |
| (adverb) with a side facing an object | - |
| (verb) collide with the broad side of | - |
| 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 | - |
| broadwise | (adverb) in the direction of the breadth | Synonyms: breadthways, breadthwise |
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| 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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