| blastodermic | (adjective) of or relating to a blastoderm | Synonyms: blastodermatic |
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| blastomere | (noun) any cell resulting from cleavage of a fertilized egg | - |
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| blastomeric | (adjective) of or relating to a blastomere | - |
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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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| blastospheric | (adjective) of or relating to a blastula | Synonyms: blastular |
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| blather | (noun) foolish gibberish | Synonyms: blatherskite |
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| (verb) to talk foolishly | Synonyms: babble, blether, blither, smatter |
| blatherskite | (noun) foolish gibberish | Synonyms: blather |
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| 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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| 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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| bleeder | (noun) someone who has hemophilia and is subject to uncontrollable bleeding | Synonyms: haemophile, haemophiliac, hemophile, hemophiliac |
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| blender | (noun) an electrically powered mixer with whirling blades that mix or chop or liquefy foods | Synonyms: liquidiser, liquidizer |
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| blether | (noun) idle or foolish and irrelevant talk | Synonyms: chin music, idle talk, prate, prattle |
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| (verb) to talk foolishly | Synonyms: babble, blather, blither, smatter |
| blighter | (noun) a persistently annoying person | Synonyms: cuss, gadfly, pest, pesterer |
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| (noun) a boy or man | Synonyms: bloke, chap, cuss, fella, feller, fellow, gent, lad |
| blinder | (noun) blind consisting of a leather eyepatch sewn to the side of the halter that prevents a horse from seeing something on either side | Synonyms: blinker, winker |
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| blinker | (noun) a light that flashes on and off; used as a signal or to send messages | Synonyms: flasher |
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| (noun) blind consisting of a leather eyepatch sewn to the side of the halter that prevents a horse from seeing something on either side | Synonyms: blinder, winker |
| (noun) a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn | Synonyms: trafficator, turn indicator, turn signal |
| (verb) put blinders on (a horse) | - |
| blister | (noun) (pathology) an elevation of the skin filled with serous fluid | Synonyms: bleb, bulla |
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| (noun) (botany) a swelling on a plant similar to that on the skin | - |
| (noun) a flaw on a surface resulting when an applied substance does not adhere (as an air bubble in a coat of paint) | - |
| (verb) get blistered | Synonyms: vesicate |
| (verb) cause blisters to form on | - |
| (verb) subject to harsh criticism | Synonyms: scald, scorch, whip |
| blistering | (adjective) very fast; capable of quick response and great speed | Synonyms: hot, red-hot |
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| (adjective) hot enough to raise (or as if to raise) blisters | Synonyms: blistery |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, caustic, sulfurous, sulphurous, virulent, vitriolic |
| (noun) the formation of vesicles in or beneath the skin | Synonyms: vesication, vesiculation |
| blistery | (adjective) hot enough to raise (or as if to raise) blisters | Synonyms: blistering |
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| (adjective) covered with small blisters | Synonyms: blebby |
| blither | (verb) to talk foolishly | Synonyms: babble, blather, blether, smatter |
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| bloater | (noun) large fatty herring lightly salted and briefly smoked | - |
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| blockbuster | (noun) an unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel) | Synonyms: megahit, smash hit |
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| (noun) a large bomb used to demolish extensive areas (as a city block) | - |
| blocker | (noun) a class of drugs that inhibit (block) some biological process | Synonyms: blocking agent |
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| (noun) a football player whose responsibility is to block players attempting to stop an offensive play | - |
| blogger | (noun) a person who keeps and updates a blog | - |
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| bloodberry | (noun) bushy houseplant having white to pale pink flowers followed by racemes of scarlet berries; tropical Americas | Synonyms: blood berry, Rivina humilis, rouge plant, rougeberry |
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| bloodsucker | (noun) carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end | Synonyms: hirudinean, leech |
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| bloomer | (noun) an embarrassing mistake | Synonyms: blooper, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| (noun) a flower that blooms in a particular way | - |
| bloomers | (noun) (used in the plural) underpants worn by women | Synonyms: drawers, knickers, pants |
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| blooper | (noun) an embarrassing mistake | Synonyms: bloomer, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| blotter | (noun) the daily written record of events (as arrests) in a police station | Synonyms: charge sheet, day book, police blotter, rap sheet |
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| (noun) absorbent paper used to dry ink | Synonyms: blotting paper |
| blower | (noun) large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales, dolphins, porpoises, narwhals | Synonyms: cetacean, cetacean mammal |
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| (noun) a device that produces a current of air | - |
| (noun) a fan run by an electric motor | Synonyms: electric fan |
| blubber | (noun) excess bodily weight | Synonyms: avoirdupois, fat, fatness |
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| (noun) an insulating layer of fat under the skin of whales and other large marine mammals; used as a source of oil | - |
| (verb) cry or whine with snuffling | Synonyms: blub, sniffle, snivel, snuffle |
| (verb) utter while crying | Synonyms: blubber out |
| blubberer | (noun) someone who sniffles and weeps with loud sobs | - |
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| blubbery | (adjective) swollen with fat | - |
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| blucher | (noun) a high shoe with laces over the tongue | - |
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| bludgeoner | (noun) an assailant who uses a bludgeon | - |
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| blueberry | (noun) sweet edible dark-blue berries of either low-growing or high-growing blueberry plants | - |
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| (noun) any of numerous shrubs of the genus Vaccinium bearing blueberries | Synonyms: blueberry bush |
| bluffer | (noun) a person who tries to bluff other people | Synonyms: four-flusher |
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| blunder | (noun) an embarrassing mistake | Synonyms: bloomer, blooper, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| (verb) utter impulsively | Synonyms: blunder out, blurt, blurt out, ejaculate |
| (verb) make one's way clumsily or blindly | Synonyms: fumble |
| (verb) commit a faux pas or a fault or make a serious mistake | Synonyms: boob, drop the ball, goof, sin |
| blunderbuss | (noun) a short musket of wide bore with a flared muzzle | - |
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| blunderer | (noun) someone who makes mistakes because of incompetence | Synonyms: botcher, bumbler, bungler, butcher, fuckup, fumbler, sad sack, stumbler |
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| blusher | (noun) makeup consisting of a pink or red powder applied to the cheeks | Synonyms: blush, paint, rouge |
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| (noun) yellowish edible agaric that usually turns red when touched | Synonyms: Amanita rubescens, blushing mushroom |
| bluster | (noun) a swaggering show of courage | Synonyms: bravado |
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| (noun) vain and empty boasting | Synonyms: braggadocio, rhodomontade, rodomontade |
| (noun) a violent gusty wind | - |
| (noun) noisy confusion and turbulence | - |
| (verb) act in an arrogant, overly self-assured, or conceited manner | Synonyms: swagger, swash |
| (verb) show off | Synonyms: blow, boast, brag, gas, gasconade, shoot a line, swash, tout, vaunt |
| (verb) blow hard; be gusty, as of wind | - |
| blusterer | (noun) a person who causes trouble by speaking indiscreetly | Synonyms: loudmouth |
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| blustering | (adjective) blowing in violent and abrupt bursts | Synonyms: blusterous, blustery |
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| blusterous | (adjective) blowing in violent and abrupt bursts | Synonyms: blustering, blustery |
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| blustery | (adjective) noisily domineering; tending to browbeat others | Synonyms: bullying |
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| (adjective) blowing in violent and abrupt bursts | Synonyms: blustering, blusterous |
| 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 | - |
| boaster | (noun) a very boastful and talkative person | Synonyms: blowhard, braggart, bragger, line-shooter, vaunter |
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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 |
| bobber | (noun) a small float usually made of cork; attached to a fishing line | Synonyms: bob, bobfloat, cork |
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| bobbysoxer | (noun) an adolescent girl wearing bobby socks (common in the 1940s) | Synonyms: bobby-socker |
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| bodybuilder | (noun) someone who does special exercises to develop a brawny musculature | Synonyms: muscle-builder, muscle builder, musclebuilder, muscleman |
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| boiler | (noun) sealed vessel where water is converted to steam | Synonyms: steam boiler |
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| (noun) a metal pot for stewing or boiling; usually has a lid | Synonyms: kettle |
| boilerplate | (noun) thick plate iron used in the production of boilers | - |
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| (noun) standard formulations uniformly found in certain types of legal documents or news stories | - |
| boilersuit | (noun) a loose protective coverall or smock worn over ordinary clothing for dirty work | Synonyms: boilers suit, overall |
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| boisterous | (adjective) noisy and lacking in restraint or discipline | Synonyms: rambunctious, robustious, rumbustious, unruly |
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| (adjective) full of rough and exuberant animal spirits | Synonyms: knockabout |
| (adjective) violently agitated and turbulent | Synonyms: fierce, rough |
| boisterously | (adverb) in a carefree manner | Synonyms: rollickingly |
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| boisterousness | (noun) the property of being noisy and lively and unrestrained | - |
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| (noun) a turbulent and stormy state of the sea | - |
| bolero | (noun) a Spanish dance in triple time accompanied by guitar and castanets | - |
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| (noun) a short jacket; worn mostly by women | - |
| (noun) music written in the rhythm of the bolero dance | - |
| bolometer | (noun) an instrument that measures heat radiation; extremely sensitive | - |
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| bolster | (noun) a pillow that is often put across a bed underneath the regular pillows | Synonyms: long pillow |
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| (verb) add padding to | Synonyms: pad |
| (verb) support and strengthen | Synonyms: bolster up |
| (verb) prop up with a pillow or bolster | - |
| bombardier | (noun) the member of a bomber crew responsible for using the bombsight and releasing the bombs on the target | - |
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| (noun) a noncommissioned officer in the British artillery | - |
| bomber | (noun) a military aircraft that drops bombs during flight | - |
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| (noun) a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States | Synonyms: Cuban sandwich, grinder, hero, hero sandwich, hoagie, hoagy, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep |
| (noun) a person who plants bombs | - |
| bonderise | (verb) coat with a substance that will prevent corrosion | Synonyms: bonderize |
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| bonderize | (verb) coat with a substance that will prevent corrosion | Synonyms: bonderise |
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| bondholder | (noun) a holder of bonds issued by a government or corporation | - |
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| bondsperson | (noun) someone who signs a bond as surety for someone else | - |
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| boner | (noun) an embarrassing mistake | Synonyms: bloomer, blooper, blunder, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| bonesetter | (noun) someone (not necessarily a licensed physician) who sets broken bones | - |
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| boneshaker | (noun) any wheeled vehicle that is dilapidated and uncomfortable | - |
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| bonkers | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| bonzer | (adjective) remarkable or wonderful | - |
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| booger | (noun) dried nasal mucus | - |
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| (noun) an imaginary monster used to frighten children | Synonyms: bogeyman, boogeyman, bugaboo, bugbear |
| bookbinder | (noun) a worker whose trade is binding books | - |
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| bookbindery | (noun) a bookbinder's workshop; a place for binding books | - |
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| bookdealer | (noun) a dealer in books; a merchant who sells books | Synonyms: book seller |
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| booker | (noun) someone who engages a person or company for performances | Synonyms: booking agent |
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| bookkeeper | (noun) someone who records the transactions of a business | - |
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| booklover | (noun) someone who loves (and usually collects) books | Synonyms: bibliophile, book lover |
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| bookmaker | (noun) a gambler who accepts and pays off bets (especially on horse races) | Synonyms: bookie |
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| (noun) a maker of books; someone who edits or publishes or binds books | - |
| bookmarker | (noun) a marker (a piece of paper or ribbon) placed between the pages of a book to mark the reader's place | Synonyms: bookmark |
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| bookseller | (noun) the proprietor of a bookstore | - |
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| boomer | (noun) a member of the baby boom generation in the 1950s | Synonyms: baby boomer |
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| boomerang | (noun) a miscalculation that recoils on its maker | Synonyms: backfire |
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| (noun) a curved piece of wood; when properly thrown will return to thrower | Synonyms: throw stick, throwing stick |
| (verb) return to the initial position from where it came; like a boomerang | - |
| booster | (noun) an additional dose that makes sure the first dose was effective | Synonyms: booster dose, booster shot, recall dose |
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| (noun) the first stage of a multistage rocket | Synonyms: booster rocket, booster unit, takeoff booster, takeoff rocket |
| (noun) an amplifier for restoring the strength of a transmitted signal | Synonyms: booster amplifier, booster station, relay link, relay station, relay transmitter |
| (noun) a thief who steals goods that are in a store | Synonyms: lifter, shoplifter |
| (noun) someone who is an active supporter and advocate | Synonyms: plugger, promoter |
| (noun) a person who backs a politician or a team etc. | Synonyms: admirer, champion, friend, protagonist, supporter |
| bootlegger | (noun) someone who makes or sells illegal liquor | Synonyms: moonshiner |
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| bootlicker | (noun) someone who humbles himself as a sign of respect; who behaves as if he had no self-respect | Synonyms: apple polisher, fawner, groveler, groveller, truckler |
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| bootmaker | (noun) a maker of boots | Synonyms: boot maker |
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| boozer | (noun) a person who drinks alcohol to excess habitually | Synonyms: alcoholic, alky, dipsomaniac, lush, soaker, souse |
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| border | (noun) a strip forming the outer edge of something | - |
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| (noun) a decorative recessed or relieved surface on an edge | Synonyms: molding, moulding |
| (noun) a line that indicates a boundary | Synonyms: borderline, boundary line, delimitation, mete |
| (noun) the boundary of a surface | Synonyms: edge |
| (noun) the boundary line or the area immediately inside the boundary | Synonyms: margin, perimeter |
| (verb) lie adjacent to another or share a boundary | Synonyms: abut, adjoin, butt, butt against, butt on, edge, march |
| (verb) extend on all sides of simultaneously; encircle | Synonyms: environ, ring, skirt, surround |
| (verb) enclose in or as if in a frame | Synonyms: frame, frame in |
| (verb) provide with a border or edge | Synonyms: edge |
| (verb) form the boundary of; be contiguous to | Synonyms: bound |
| bordered | (adjective) having a border especially of a specified kind; sometimes used as a combining term | - |
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| borderer | (noun) an inhabitant of a border area (especially the border between Scotland and England) | - |
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| borderland | (noun) district consisting of the area on either side of a border or boundary of a country or an area | Synonyms: border district, march, marchland |
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| borderline | (adjective) of questionable or minimal quality | Synonyms: marginal |
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| (noun) a line that indicates a boundary | Synonyms: border, boundary line, delimitation, mete |
| borer | (noun) any of various insects or larvae or mollusks that bore into wood | Synonyms: woodborer |
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| (noun) a drill for penetrating rock | Synonyms: bore bit, rock drill, stone drill |
| borrower | (noun) someone who receives something on the promise to return it or its equivalent | - |
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| botcher | (noun) someone who makes mistakes because of incompetence | Synonyms: blunderer, bumbler, bungler, butcher, fuckup, fumbler, sad sack, stumbler |
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| bother | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, botheration, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) an angry disturbance | Synonyms: fuss, hassle, trouble |
| (verb) cause annoyance in; disturb, especially by minor irritations | Synonyms: annoy, chafe, devil, get at, get to, gravel, irritate, nark, nettle, rag, rile, vex |
| (verb) make confused or perplexed or puzzled | - |
| (verb) make nervous or agitated | - |
| (verb) intrude or enter uninvited | - |
| (verb) take the trouble to do something; concern oneself | Synonyms: inconvenience oneself, trouble, trouble oneself |
| (verb) to cause inconvenience or discomfort to | Synonyms: discommode, disoblige, incommode, inconvenience, put out, trouble |