| bigeye | (noun) red fishes of American coastal tropical waters having very large eyes and rough scales | - |
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| bike | (noun) a wheeled vehicle that has two wheels and is moved by foot pedals | Synonyms: bicycle, cycle, wheel |
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| (noun) a motor vehicle with two wheels and a strong frame | Synonyms: motorcycle |
| (verb) ride a bicycle | Synonyms: bicycle, cycle, pedal, wheel |
| bilabiate | (adjective) having two lips | Synonyms: two-lipped |
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| bile | (noun) a digestive juice secreted by the liver and stored in the gallbladder; aids in the digestion of fats | Synonyms: gall |
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| bilestone | (noun) a calculus formed in the gall bladder or its ducts | Synonyms: gallstone |
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| bilge | (noun) where the sides of the vessel curve in to form the bottom | - |
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| (noun) water accumulated in the bilge of a ship | Synonyms: bilge water |
| (verb) take in water at the bilge | Synonyms: take in water |
| (verb) cause to leak | - |
| billingsgate | (noun) foul-mouthed or obscene abuse | Synonyms: scurrility |
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| billionaire | (noun) a very rich person whose material wealth is valued at more than a billion dollars | - |
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| bilobate | (adjective) divided into two lobes | Synonyms: bilobated, bilobed |
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| biloculate | (adjective) divided into or containing two cells or chambers | Synonyms: bilocular |
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| binate | (adjective) growing in two parts or in pairs | - |
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| bindable | (adjective) capable of being fastened or secured with a rope or bond | Synonyms: bondable |
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| bine | (noun) European twining plant whose flowers are used chiefly to flavor malt liquors; cultivated in America | Synonyms: common hop, common hops, European hop, Humulus lupulus |
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| binge | (noun) an occasion for excessive eating or drinking | Synonyms: bout, bust, tear |
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| (noun) any act of immoderate indulgence | Synonyms: orgy, splurge |
| (verb) overeat or eat immodestly; make a pig of oneself | Synonyms: englut, engorge, glut, gorge, gormandise, gormandize, gourmandize, ingurgitate, overeat, overgorge, overindulge, pig out, satiate, scarf out, stuff |
| (verb) to watch a large amount of media in a single seating | - |
| bingle | (noun) a base hit on which the batter stops safely at first base | Synonyms: single |
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| binnacle | (noun) a nonmagnetic housing for a ship's compass (usually in front of the helm) | - |
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| binucleate | (adjective) having two nuclei | Synonyms: binuclear, binucleated |
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| biodefence | (noun) procedures involved in taking defensive measures against attacks using biological agents | Synonyms: biodefense, biological defence, biological defense |
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| biodefense | (noun) procedures involved in taking defensive measures against attacks using biological agents | Synonyms: biodefence, biological defence, biological defense |
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| biodegradable | (adjective) capable of being decomposed by e.g. bacteria | - |
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| biodegrade | (verb) break down naturally through the action of biological agents | - |
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| bioluminescence | (noun) luminescence produced by physiological processes (as in the firefly) | - |
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| biome | (noun) a major biotic community characterized by the dominant forms of plant life and the prevailing climate | - |
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| biomedicine | (noun) the branch of medical science that studies the ability of organisms to withstand environmental stress (as in space travel) | - |
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| (noun) the branch of medical science that applies biological and physiological principles to clinical practice | - |
| bioscience | (noun) any of the branches of natural science dealing with the structure and behavior of living organisms | Synonyms: life science |
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| bioscope | (noun) a kind of early movie projector | - |
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| (noun) a South African movie theater | - |
| biosphere | (noun) the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist | - |
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| biotite | (noun) dark brown to black mica found in igneous and metamorphic rock | - |
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| biotype | (noun) organisms sharing a specified genotype or the genotype (or peculiarities) so shared | - |
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| bipartite | (adjective) divided into two portions almost to the base | - |
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| (adjective) involving two parts or elements | Synonyms: two-part, two-way |
| bipinnate | (adjective) of a leaf shape; having doubly pinnate leaflets (as ferns) | - |
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| biplane | (noun) old fashioned airplane; has two wings one above the other | - |
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| biquadrate | (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadratic, fourth power, quartic |
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| birdcage | (noun) a cage in which a bird can be kept | - |
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| birdhouse | (noun) a shelter for birds | - |
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| birdie | (noun) badminton equipment consisting of a ball of cork or rubber with a crown of feathers | Synonyms: bird, shuttle, shuttlecock |
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| (noun) (golf) a score of one stroke under par on a hole | - |
| (verb) shoot in one stroke under par | - |
| birdlime | (noun) a sticky adhesive that is smeared on small branches to capture small birds | Synonyms: lime |
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| (verb) spread birdlime on branches to catch birds | Synonyms: lime |
| birefringence | (noun) splitting a ray into two parallel rays polarized perpendicularly | Synonyms: double refraction |
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| birle | (verb) cause a floating log to rotate by treading | Synonyms: birl |
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| birthplace | (noun) the place where someone was born | Synonyms: place of birth |
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| (noun) where something originated or was nurtured in its early existence | Synonyms: cradle, place of origin, provenance, provenience |
| birthrate | (noun) the ratio of live births in an area to the population of that area; expressed per 1000 population per year | Synonyms: birth rate, fertility, fertility rate, natality |
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| bise | (noun) a dry cold north wind in southeastern France | Synonyms: bize |
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| biserrate | (adjective) having saw-like notches with the notches themselves similarly notched | - |
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| bisontine | (adjective) relating to or characteristic of bison | - |
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| bisque | (noun) a thick cream soup made from shellfish | - |
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| bistre | (noun) a water-soluble brownish-yellow pigment made by boiling wood soot | Synonyms: bister |
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| bisulcate | (adjective) (used of hooves) split, divided | Synonyms: cloven |
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| bisulfate | (noun) a salt or an ester of sulphuric acid with the chemical formula HSO4-. | Synonyms: hydrogen sulfate |
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| bitartrate | (noun) an acid tartrate; a hydrogen tartrate | - |
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| bite | (noun) the act of gripping or chewing off with the teeth and jaws | Synonyms: chomp |
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| (noun) a portion removed from the whole | - |
| (noun) a strong odor or taste property | Synonyms: pungency, raciness, sharpness |
| (noun) wit having a sharp and caustic quality | Synonyms: pungency |
| (noun) (angling) an instance of a fish taking the bait | - |
| (noun) a light informal meal | Synonyms: collation, snack |
| (noun) a small amount of solid food; a mouthful | Synonyms: bit, morsel |
| (noun) a wound resulting from biting by an animal or a person | - |
| (noun) a painful wound caused by the thrust of an insect's stinger into skin | Synonyms: insect bite, sting |
| (verb) to grip, cut off, or tear with or as if with the teeth or jaws | Synonyms: seize with teeth |
| (verb) penetrate or cut, as with a knife | - |
| (verb) deliver a sting to | Synonyms: prick, sting |
| (verb) cause a sharp or stinging pain or discomfort | Synonyms: burn, sting |
| biteplate | (noun) a removable dental appliance that is worn in the palate for diagnostic or therapeutic purposes | Synonyms: bite plate |
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| bittie | (adjective) (used informally) little or tiny | Synonyms: bitty, itsy-bitsy, itty-bitty, teensy-weensy, teensy, teentsy, teeny-weeny, teeny, wee, weensy, weeny |
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| bituminise | (verb) treat with bitumen | Synonyms: bituminize |
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| bituminize | (verb) treat with bitumen | Synonyms: bituminise |
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| bivalve | (adjective) used of mollusks having two shells (as clams etc.) | Synonyms: bivalved |
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| (noun) marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together | Synonyms: lamellibranch, pelecypod |
| bivariate | (adjective) having two variables | - |
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| bizarre | (adjective) conspicuously or grossly unconventional or unusual | Synonyms: eccentric, flakey, flaky, freakish, freaky, gonzo, off-the-wall, outlandish, outre |
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| bize | (noun) a dry cold north wind in southeastern France | Synonyms: bise |
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| blackbeetle | (noun) dark brown cockroach originally from orient now nearly cosmopolitan in distribution | Synonyms: Asiatic cockroach, Blatta orientalis, oriental cockroach, oriental roach |
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| blackface | (noun) the makeup (usually burnt cork) used by a performer in order to imitate a Negro | - |
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| blacksnake | (noun) blackish racer of the eastern United States that grows to six feet | Synonyms: black racer, Coluber constrictor |
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| (noun) large harmless shiny black North American snake | Synonyms: black rat snake, Elaphe obsoleta, mountain blacksnake, pilot blacksnake |
| bladderlike | (adjective) resembling a bladder | Synonyms: bladdery |
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| bladdernose | (noun) medium-sized blackish-grey seal with large inflatable sac on the head; of Arctic and northern Atlantic waters | Synonyms: Cystophora cristata, hooded seal |
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| blade | (noun) the flat part of a tool or weapon that (usually) has a cutting edge | - |
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| (noun) a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard | Synonyms: brand, steel, sword |
| (noun) flat surface that rotates and pushes against air or water | Synonyms: vane |
| (noun) the part of the skate that slides on the ice | - |
| (noun) a broad flat body part (as of the shoulder or tongue) | - |
| (noun) a cut of beef from the shoulder blade | - |
| (noun) something long and thin resembling a blade of grass | - |
| (noun) a dashing young man | - |
| (noun) especially a leaf of grass or the broad portion of a leaf as distinct from the petiole | Synonyms: leaf blade |
| bladelike | (adjective) shaped like a sword blade | Synonyms: ensiform, sword-shaped, swordlike |
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| blae | (adjective) of bluish-black or grey-blue | - |
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| blamable | (adjective) deserving blame or censure as being wrong or evil or injurious | Synonyms: blameable, blameful, blameworthy, censurable, culpable |
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| blame | (adjective) expletives used informally as intensifiers | Synonyms: blamed, blasted, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned, infernal |
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| (noun) a reproach for some lapse or misdeed | Synonyms: rap |
| (noun) an accusation that you are responsible for some lapse or misdeed | Synonyms: incrimination, inculpation |
| (verb) attribute responsibility to | Synonyms: charge |
| (verb) put or pin the blame on | Synonyms: fault |
| (verb) harass with constant criticism | Synonyms: find fault, pick |
| blameable | (adjective) deserving blame or censure as being wrong or evil or injurious | Synonyms: blamable, blameful, blameworthy, censurable, culpable |
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| blancmange | (noun) sweet almond-flavored milk pudding thickened with gelatin or cornstarch; usually molded | - |
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| blare | (noun) a loud harsh or strident noise | Synonyms: blaring, cacophony, clamor, din |
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| (verb) make a strident noise | Synonyms: beep, claxon, honk, toot |
| (verb) make a strident sound | Synonyms: blast |
| blase | (adjective) very sophisticated especially because of surfeit; versed in the ways of the world | Synonyms: worldly |
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| (adjective) nonchalantly unconcerned | - |
| (adjective) uninterested because of frequent exposure or indulgence | Synonyms: bored |
| blaspheme | (verb) utter obscenities or profanities | Synonyms: curse, cuss, imprecate, swear |
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| (verb) speak of in an irreverent or impious manner | - |
| blastocele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocoel, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoel, cleavage cavity, segmentation cavity |
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| blastocyte | (noun) an undifferentiated embryonic cell | - |
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| blastomere | (noun) any cell resulting from cleavage of a fertilized egg | - |
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| blastomycete | (noun) any of various yeastlike budding fungi of the genus Blastomyces; cause disease in humans and other animals | - |
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| blastopore | (noun) the opening into the archenteron | - |
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| blastosphere | (noun) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs | Synonyms: blastula |
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| blate | (adjective) disposed to avoid notice | Synonyms: bashful |
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| (verb) cry plaintively | Synonyms: baa, blat, bleat |
| blatherskite | (noun) foolish gibberish | Synonyms: blather |
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| blaze | (noun) noisy and unrestrained mischief | Synonyms: hell |
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| (noun) a light within the field of vision that is brighter than the brightness to which the eyes are adapted | Synonyms: brilliance, glare |
| (noun) a light-colored marking | - |
| (noun) a cause of difficulty and suffering | Synonyms: hell |
| (noun) a strong flame that burns brightly | Synonyms: blazing |
| (verb) indicate by marking trees with blazes | - |
| (verb) shoot rapidly and repeatedly | Synonyms: blaze away |
| (verb) move rapidly and as if blazing | Synonyms: blaze out |
| (verb) burn brightly and intensely | - |
| (verb) shine brightly and intensively | - |
| blende | (noun) an ore that is the chief source of zinc; consists largely of zinc sulfide in crystalline form | Synonyms: sphalerite, zinc blende |
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| blindside | (verb) attack or hit on or from the side where the attacked person's view is obstructed | - |
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| (verb) catch unawares, especially with harmful consequences | - |
| blintze | (noun) (Judaism) thin pancake folded around a filling and fried or baked | Synonyms: blintz |
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| blithe | (adjective) carefree and happy and lighthearted | Synonyms: blithesome, light-hearted, lighthearted, lightsome |
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| (adjective) lacking or showing a lack of due concern | - |
| blithesome | (adjective) carefree and happy and lighthearted | Synonyms: blithe, light-hearted, lighthearted, lightsome |
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| blockade | (noun) a war measure that isolates some area of importance to the enemy | Synonyms: encirclement |
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| (noun) prevents access or progress | - |
| (verb) impose a blockade on | Synonyms: seal off |
| (verb) obstruct access to | Synonyms: block off |
| (verb) render unsuitable for passage | Synonyms: bar, barricade, block, block off, block up, stop |
| (verb) hinder or prevent the progress or accomplishment of | Synonyms: block, embarrass, hinder, obstruct, stymie, stymy |
| blockage | (noun) the act of blocking | Synonyms: closure, occlusion |
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| (noun) an obstruction in a pipe or tube | Synonyms: block, closure, occlusion, stop, stoppage |
| (noun) the physical condition of blocking or filling a passage with an obstruction | Synonyms: obstruction |
| blockhouse | (noun) a stronghold that is reinforced for protection from enemy fire; with apertures for defensive fire | - |
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| bloke | (noun) a boy or man | Synonyms: blighter, chap, cuss, fella, feller, fellow, gent, lad |
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| blonde | (adjective) being or having light colored skin and hair and usually blue or grey eyes | Synonyms: blond, light-haired |
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| (noun) a light grayish yellow to near white | Synonyms: blond |
| (noun) a female person with fair skin and hair | - |
| bloodline | (noun) ancestry of a purebred animal | Synonyms: pedigree |
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| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| bloodmobile | (noun) a motor vehicle equipped to collect blood donations | - |
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| bloodstone | (noun) green chalcedony with red spots that resemble blood | Synonyms: heliotrope |
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| blouse | (noun) a top worn by women | - |
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| bloviate | (verb) orate verbosely and windily | - |
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| blowhole | (noun) a hole for the escape of gas or air | Synonyms: vent-hole, vent, venthole |
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| (noun) the spiracle of a cetacean located far back on the skull | - |
| blowpipe | (noun) a tube that directs air or gas into a flame to concentrate heat | Synonyms: blow tube, blowtube |
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| (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowgun, blowtube |