| bellyache | (noun) an ache localized in the stomach or abdominal region | Synonyms: gastralgia, stomach ache, stomachache |
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| belvedere | (noun) a gazebo sited to command a fine view | - |
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| (noun) densely branched Eurasian plant; foliage turns purple-red in autumn | Synonyms: Bassia scoparia, burning bush, fire-bush, fire bush, Kochia scoparia, summer cypress |
| benedictine | (noun) a French liqueur originally made by Benedictine monks | - |
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| benefice | (noun) an endowed church office giving income to its holder | Synonyms: ecclesiastical benefice |
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| beneficence | (noun) the quality of being kind or helpful or generous | - |
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| (noun) doing good; feeling beneficent | - |
| benevolence | (noun) an act intending or showing kindness and good will | Synonyms: benefaction |
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| (noun) an inclination to do kind or charitable acts | - |
| (noun) disposition to do good | - |
| benne | (noun) East Indian annual erect herb; source of sesame seed or benniseed and sesame oil | Synonyms: benni, benny, sesame, Sesamum indicum |
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| bennie | (noun) a form of amphetamine | Synonyms: Benzedrine |
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| bentonite | (noun) an absorbent aluminum silicate clay formed from volcanic ash | - |
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| benzene | (noun) a colorless liquid hydrocarbon; highly flammable; carcinogenic; the simplest of the aromatic compounds | Synonyms: benzine, benzol |
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| benzine | (noun) a colorless liquid hydrocarbon; highly flammable; carcinogenic; the simplest of the aromatic compounds | Synonyms: benzene, benzol |
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| benzoate | (noun) any salt or ester of benzoic acid | - |
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| benzocaine | (noun) a white crystalline ester used as a local anesthetic | Synonyms: ethyl aminobenzoate |
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| benzodiazepine | (noun) any of several similar lipophilic amines used as tranquilizers or sedatives or hypnotics or muscle relaxants; chronic use can lead to dependency | - |
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| benzoquinone | (noun) any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes | Synonyms: quinone |
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| berceuse | (noun) a quiet song intended to lull a child to sleep | Synonyms: cradlesong, lullaby |
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| beroe | (noun) delicately iridescent thimble-shaped ctenophores | - |
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| betaine | (noun) a sweet tasting alkaloid that occurs in sugar beets | - |
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| betise | (noun) a stupid mistake | Synonyms: folly, foolishness, imbecility, stupidity |
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| beverage | (noun) any liquid suitable for drinking | Synonyms: drink, drinkable, potable |
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| bezique | (noun) a card game played with a pack of forty-eight cards (two of each suit for high cards); play resembles whist | Synonyms: penuchle, pinochle, pinocle |
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| bible | (noun) a book regarded as authoritative in its field | - |
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| bibliophile | (noun) someone who loves (and usually collects) books | Synonyms: book lover, booklover |
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| bibliopole | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopolist |
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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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| bichloride | (noun) a compound containing two chlorine atoms per molecule | Synonyms: dichloride |
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| bichromate | (noun) a salt of the hypothetical dichromic acid | Synonyms: dichromate |
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| bicorne | (noun) a cocked hat with the brim turned up to form two points | Synonyms: bicorn |
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| bicycle | (noun) a wheeled vehicle that has two wheels and is moved by foot pedals | Synonyms: bike, cycle, wheel |
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| bigarade | (noun) any of various common orange trees yielding sour or bitter fruit; used as grafting stock | Synonyms: bitter orange, bitter orange tree, Citrus aurantium, marmalade orange, Seville orange, sour orange |
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| 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 |
| 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 |
| 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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| 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 |
| 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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| 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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| 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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| 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 | - |
| birdlime | (noun) a sticky adhesive that is smeared on small branches to capture small birds | Synonyms: lime |
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| birefringence | (noun) splitting a ray into two parallel rays polarized perpendicularly | Synonyms: double refraction |
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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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| 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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| 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 |
| biteplate | (noun) a removable dental appliance that is worn in the palate for diagnostic or therapeutic purposes | Synonyms: bite plate |
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| bivalve | (noun) marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together | Synonyms: lamellibranch, pelecypod |
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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 |
| 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 |
| blame | (noun) a reproach for some lapse or misdeed | Synonyms: rap |
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| (noun) an accusation that you are responsible for some lapse or misdeed | Synonyms: incrimination, inculpation |
| 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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| 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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| 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 |
| 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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| blintze | (noun) (Judaism) thin pancake folded around a filling and fried or baked | Synonyms: blintz |
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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 | - |
| 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 | (noun) a light grayish yellow to near white | Synonyms: blond |
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| (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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| 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 |
| blowtube | (noun) a tube that directs air or gas into a flame to concentrate heat | Synonyms: blow tube, blowpipe |
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| (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowgun, blowpipe |