| blabber | (noun) one who reveals confidential information to the police or other authority | Synonyms: betrayer, informer, rat, squealer |
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| blabbermouth | (noun) someone who gossips indiscreetly | Synonyms: talebearer, taleteller, tattler, tattletale, telltale |
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| black | (noun) black clothing (worn as a sign of mourning) | - |
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| (noun) (board games) the darker pieces | - |
| (noun) the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) | Synonyms: blackness, inkiness |
| (noun) total absence of light | Synonyms: blackness, lightlessness, pitch blackness, total darkness |
| blackamoor | (noun) a person with dark skin who comes from Africa (or whose ancestors came from Africa) | Synonyms: Black person |
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| blackball | (noun) the act of excluding someone by a negative vote or veto | Synonyms: barring |
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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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| blackberry | (noun) large sweet black or very dark purple edible aggregate fruit of any of various bushes of the genus Rubus | - |
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| (noun) bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle | Synonyms: blackberry bush |
| blackbird | (noun) any bird of the family Icteridae whose male is black or predominantly black | Synonyms: New World blackbird |
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| (noun) common black European thrush | Synonyms: European blackbird, merl, merle, ousel, ouzel, Turdus merula |
| blackboard | (noun) sheet of slate; for writing with chalk | Synonyms: chalkboard |
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| blackbody | (noun) a hypothetical object capable of absorbing all the electromagnetic radiation falling on it | Synonyms: black body, full radiator |
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| blackbuck | (noun) common Indian antelope with a dark back and spiral horns | Synonyms: Antilope cervicapra, black buck |
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| 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 |
| blackcock | (noun) male black grouse | Synonyms: black cock |
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| blackdamp | (noun) the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life | Synonyms: chokedamp |
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| blackening | (noun) changing to a darker color | Synonyms: darkening |
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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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| blackfish | (noun) female salmon that has recently spawned | - |
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| (noun) small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school | Synonyms: black whale, common blackfish, Globicephala melaena, pilot whale |
| (noun) large dark-colored food fish of the Atlantic coast of North America | Synonyms: tautog, Tautoga onitis |
| blackfly | (noun) small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals | Synonyms: black fly, buffalo gnat |
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| (noun) blackish aphid that infests e.g. beans and sugar beets | Synonyms: Aphis fabae, bean aphid |
| blackguard | (noun) someone who is morally reprehensible | Synonyms: bounder, cad, dog, heel, hound |
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| blackhead | (noun) a black-tipped plug clogging a pore of the skin | Synonyms: comedo |
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| blackheart | (noun) heart cherry with dark flesh and skin | Synonyms: blackheart cherry |
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| (noun) any of various diseases in which the central tissues blacken | - |
| blacking | (noun) a substance used to produce a shiny protective surface on footwear | Synonyms: shoe polish |
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| blackjack | (noun) a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21 | Synonyms: twenty-one, vingt-et-un |
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| (noun) a piece of metal covered by leather with a flexible handle; used for hitting people | Synonyms: cosh, sap |
| (noun) a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship | Synonyms: black flag, Jolly Roger, pirate flag |
| (noun) a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets | Synonyms: blackjack oak, jack oak, Quercus marilandica |
| blackleg | (noun) someone who works (or provides workers) during a strike | Synonyms: rat, scab, strikebreaker |
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| blacklist | (noun) a list of people who are out of favor | Synonyms: black book, shitlist |
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| blackmail | (noun) extortion of money by threats to divulge discrediting information | - |
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| blackmailer | (noun) a criminal who extorts money from someone by threatening to expose embarrassing information about them | Synonyms: extortioner, extortionist |
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| blackness | (noun) the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) | Synonyms: black, inkiness |
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| (noun) total absence of light | Synonyms: black, lightlessness, pitch blackness, total darkness |
| blackout | (noun) a momentary loss of consciousness | - |
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| (noun) partial or total loss of memory | Synonyms: amnesia, memory loss |
| (noun) the failure of electric power for a general region | - |
| (noun) darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft) | Synonyms: brownout, dimout |
| (noun) a suspension of radio or tv broadcasting | - |
| blackpoll | (noun) North American warbler having a black-and-white head | Synonyms: Dendroica striate |
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| blackseed | (noun) grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus | Synonyms: carpet grass, smut grass, Sporobolus poiretii |
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| blacksmith | (noun) a smith who forges and shapes iron with a hammer and anvil | - |
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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 |
| blacktail | (noun) mule deer of western Rocky Mountains | Synonyms: black-tailed deer, blacktail deer, Odocoileus hemionus columbianus |
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| blackthorn | (noun) erect and almost thornless American hawthorn with somewhat pear-shaped berries | Synonyms: Crataegus calpodendron, Crataegus tomentosa, pear haw, pear hawthorn |
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| (noun) a thorny Eurasian bush with plumlike fruits | Synonyms: Prunus spinosa, sloe |
| blacktop | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktopping |
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| blacktopping | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktop |
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| blackwash | (noun) a wash that colors a surface black | - |
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| (noun) a mixture of calomel and limewater that is used on syphilitic sores | Synonyms: black lotion |
| (noun) an attack intended to ruin someone's reputation | Synonyms: assassination, character assassination |
| blackwater | (noun) any of several human or animal diseases characterized by dark urine resulting from rapid breakdown of red blood cells | - |
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| blackwood | (noun) any of several hardwood trees yielding very dark-colored wood | Synonyms: blackwood tree |
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| (noun) very dark wood of any of several blackwood trees | - |
| bladder | (noun) a bag that fills with air | - |
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| (noun) a distensible membranous sac (usually containing liquid or gas) | Synonyms: vesica |
| 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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| bladderpod | (noun) any of several hairy North American herbs having yellow racemose flowers and inflated pods | - |
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| (noun) any of several plants of the genus Physaria having racemose yellow flowers and inflated pods | - |
| (noun) annual or perennial herbs with inflated seed pods; some placed in genus Lesquerella | - |
| (noun) North American wild lobelia having small blue flowers and inflated capsules formerly used as an antispasmodic | Synonyms: Indian tobacco, Lobelia inflata |
| bladderwort | (noun) any of numerous aquatic carnivorous plants of the genus Utricularia some of whose leaves are modified as small urn-shaped bladders that trap minute aquatic animals | - |
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| bladderwrack | (noun) a common rockweed used in preparing kelp and as manure | Synonyms: black rockweed, bladder fucus, Fucus vesiculosus, tang |
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| (noun) similar to and found with black rockweed | Synonyms: Ascophyllum nodosum |
| 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 |
| blaeberry | (noun) erect European blueberry having solitary flowers and blue-black berries | Synonyms: bilberry, Viccinium myrtillus, whinberry, whortleberry |
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| blah | (noun) pompous or pretentious talk or writing | Synonyms: bombast, claptrap, fustian, rant |
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| blahs | (noun) a general feeling of boredom and dissatisfaction | - |
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| blain | (noun) an inflammatory swelling or sore | - |
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| 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 |
| blamelessness | (noun) a state of innocence | Synonyms: guiltlessness, inculpability, inculpableness |
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| blameworthiness | (noun) a state of guilt | Synonyms: culpability, culpableness |
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| blanc | (noun) a white sauce of fat, broth, and vegetables (used especially with braised meat) | - |
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| blancmange | (noun) sweet almond-flavored milk pudding thickened with gelatin or cornstarch; usually molded | - |
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| blandishment | (noun) the act of urging by means of teasing or flattery | Synonyms: wheedling |
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| (noun) flattery intended to persuade | Synonyms: cajolery, palaver |
| blandness | (noun) lacking any distinctive or interesting taste property | Synonyms: insipidity, insipidness |
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| (noun) the quality of being bland and gracious or ingratiating in manner | Synonyms: smoothness, suaveness, suavity |
| (noun) the trait of exhibiting no personal embarrassment or concern | - |
| blank | (noun) a cartridge containing an explosive charge but no bullet | Synonyms: blank shell, dummy |
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| (noun) a piece of material ready to be made into something | - |
| (noun) a blank gap or missing part | Synonyms: lacuna |
| (noun) a blank character used to separate successive words in writing or printing | Synonyms: space |
| blanket | (noun) bedding that keeps a person warm in bed | Synonyms: cover |
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| (noun) a layer of lead surrounding the highly reactive core of a nuclear reactor | - |
| (noun) anything that covers | Synonyms: mantle |
| blankness | (noun) the state of being blank; void; emptiness | - |
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| blanquillo | (noun) important marine food fishes | Synonyms: tilefish |
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| blare | (noun) a loud harsh or strident noise | Synonyms: blaring, cacophony, clamor, din |
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| blaring | (noun) a loud harsh or strident noise | Synonyms: blare, cacophony, clamor, din |
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| blarney | (noun) flattery designed to gain favor | Synonyms: coaxing, soft soap, sweet talk |
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| blasphemer | (noun) a person who speaks disrespectfully of sacred things | - |
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| blasphemy | (noun) blasphemous behavior; the act of depriving something of its sacred character | Synonyms: desecration, profanation, sacrilege |
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| (noun) blasphemous language (expressing disrespect for God or for something sacred) | - |
| blast | (noun) a very long fly ball | - |
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| (noun) intense adverse criticism | Synonyms: attack, fire, flack, flak |
| (noun) an explosion (as of dynamite) | - |
| (noun) a sudden very loud noise | Synonyms: bam, bang, clap, eruption |
| (noun) a highly pleasurable or exciting experience | Synonyms: good time |
| (noun) a strong current of air | Synonyms: blow, gust |
| blastema | (noun) a mass of undifferentiated cells from which an organ or body part develops | - |
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| blaster | (noun) a workman employed to blast with explosives | Synonyms: chargeman |
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| blastocele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocoel, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoel | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, 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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| blastocyst | (noun) the blastula of a placental mammal in which some differentiation of cells has occurred | Synonyms: blastodermic vessicle |
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| blastocyte | (noun) an undifferentiated embryonic cell | - |
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| blastocytoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastoma, embryonal carcinosarcoma |
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| blastoderm | (noun) a layer of cells on the inside of the blastula | Synonyms: blastodisc, germinal area, germinal disc |
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| blastodisc | (noun) a layer of cells on the inside of the blastula | Synonyms: blastoderm, germinal area, germinal disc |
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| blastoff | (noun) the launching of a missile or spacecraft to a specified destination | Synonyms: shot |
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| blastogenesis | (noun) theory that inherited characteristics are transmitted by germ plasm | - |
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| (noun) asexual reproduction by budding | - |
| blastoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastocytoma, embryonal carcinosarcoma |
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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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| blastomycosis | (noun) any of several infections of the skin or mucous membrane caused by Blastomyces | - |
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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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| blastula | (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: blastosphere |
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| blatancy | (noun) the property of being both obvious and offensive | - |
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| blather | (noun) foolish gibberish | Synonyms: blatherskite |
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| blatherskite | (noun) foolish gibberish | Synonyms: blather |
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| blaxploitation | (noun) the exploitation of black people (especially with regard to stereotyped roles in movies) | - |
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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 |
| blazer | (noun) lightweight single-breasted jacket; often striped in the colors of a club or school | Synonyms: sport coat, sport jacket, sports coat, sports jacket |
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| blazing | (noun) a strong flame that burns brightly | Synonyms: blaze |
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| blazon | (noun) the official symbols of a family, state, etc. | Synonyms: arms, blazonry, coat of arms |
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| blazonry | (noun) the official symbols of a family, state, etc. | Synonyms: arms, blazon, coat of arms |
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| bleach | (noun) the act of whitening something by bleaching it (exposing it to sunlight or using a chemical bleaching agent) | - |
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| (noun) the whiteness that results from removing the color from something | - |
| (noun) an agent that makes things white or colorless | Synonyms: blanching agent, bleaching agent, whitener |
| bleacher | (noun) a worker who bleaches (cloth or flour etc.) | - |
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| bleachers | (noun) (used in the plural) an outdoor grandstand without a roof; patrons are exposed to the sun as linens are when they are bleached | - |
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| bleakness | (noun) a bleak and desolate atmosphere | Synonyms: bareness, desolation, nakedness |
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| bleat | (noun) the sound of sheep or goats (or any sound resembling this) | - |
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