| ablactation | (noun) the act of substituting other food for the mother's milk in the diet of a child or young mammal | Synonyms: weaning |
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| (noun) the cessation of lactation | - |
| ablation | (noun) surgical removal of a body part or tissue | Synonyms: cutting out, excision, extirpation |
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| (noun) the erosive process that reduces the size of glaciers | - |
| ablative | (noun) the case indicating the agent in passive sentences or the instrument or manner or place of the action described by the verb | Synonyms: ablative case |
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| ablaut | (noun) a vowel whose quality or length is changed to indicate linguistic distinctions (such as sing sang sung song) | - |
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| ableism | (noun) discrimination in favor of the able-bodied | Synonyms: able-bodiedism, able-bodism, ablism |
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| ablepharia | (noun) a congenital absence of eyelids (partial or complete) | - |
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| ablism | (noun) discrimination in favor of the able-bodied | Synonyms: able-bodiedism, able-bodism, ableism |
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| ablution | (noun) the ritual washing of a priest's hands or of sacred vessels | - |
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| acceptableness | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptability |
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| admirableness | (noun) admirable excellence | Synonyms: admirability, wonderfulness |
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| adorableness | (noun) extreme attractiveness | Synonyms: adorability |
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| affableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, amiability, amiableness, bonhomie, geniality |
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| agreeableness | (noun) a temperamental disposition to be agreeable | Synonyms: agreeability |
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| (noun) pleasantness resulting from agreeable conditions | Synonyms: amenity |
| alumbloom | (noun) any of several herbs of the genus Heuchera | Synonyms: alumroot |
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| amble | (noun) a leisurely walk (usually in some public place) | Synonyms: perambulation, promenade, saunter, stroll |
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| ambler | (noun) someone who walks at a leisurely pace | Synonyms: saunterer, stroller |
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| amblygonite | (noun) a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium | - |
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| amblyopia | (noun) visual impairment without apparent organic pathology | - |
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| ameloblast | (noun) a cell from which tooth enamel develops | - |
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| amenableness | (noun) the trait of being cooperative | Synonyms: amenability, cooperativeness |
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| amiableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiability, bonhomie, geniality |
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| amicableness | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicability |
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| (noun) a disinclination to quarrel | Synonyms: amicability |
| answerableness | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerability |
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| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antiestablishmentism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentarianism |
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| assemblage | (noun) the social act of assembling | Synonyms: assembly, gathering |
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| (noun) a system of components assembled together for a particular purpose | Synonyms: hookup |
| (noun) a group of persons together in one place | Synonyms: gathering |
| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, aggregation, collection |
| assembler | (noun) a program to convert assembly language into machine language | Synonyms: assembly program |
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| assembling | (noun) the act of gathering something together | Synonyms: aggregation, collecting, collection |
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| assembly | (noun) the social act of assembling | Synonyms: assemblage, gathering |
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| (noun) the act of constructing something (as a piece of machinery) | Synonyms: fabrication |
| (noun) a group of machine parts that fit together to form a self-contained unit | - |
| (noun) a public facility to meet for open discussion | Synonyms: forum, meeting place |
| (noun) a unit consisting of components that have been fitted together | - |
| (noun) a group of persons who are gathered together for a common purpose | - |
| assemblyman | (noun) someone who is a member of a legislative assembly | - |
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| assemblywoman | (noun) a woman assemblyman | - |
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| associableness | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associability |
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| attainableness | (noun) the state of being achievable | Synonyms: achievability, attainability |
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| audible | (noun) a football play is changed orally after both teams have assumed their positions at the line of scrimmage | - |
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| audibleness | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibility |
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| availableness | (noun) the quality of being at hand when needed | Synonyms: accessibility, availability, handiness |
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| babble | (noun) gibberish resembling the sounds of a baby | Synonyms: babbling, lallation |
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| babbler | (noun) any of various insectivorous Old World birds with a loud incessant song; in some classifications considered members of the family Muscicapidae | Synonyms: cackler |
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| (noun) an obnoxious and foolish and loquacious talker | Synonyms: chatterbox, chatterer, magpie, prater, spouter |
| babbling | (noun) gibberish resembling the sounds of a baby | Synonyms: babble, lallation |
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| backblast | (noun) backfire from a recoilless weapon | Synonyms: back-blast |
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| bauble | (noun) cheap showy jewelry or ornament on clothing | Synonyms: bangle, fallal, gaud, gewgaw, novelty, trinket |
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| (noun) a mock scepter carried by a court jester | - |
| bbl | (noun) any of various units of capacity | Synonyms: barrel |
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| bible | (noun) a book regarded as authoritative in its field | - |
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| bibliographer | (noun) someone trained in compiling bibliographies | - |
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| bibliography | (noun) a list of writings with time and place of publication (such as the writings of a single author or the works referred to in preparing a document etc.) | - |
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| bibliolatry | (noun) the worship of the Bible | Synonyms: Bible-worship |
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| bibliomania | (noun) preoccupation with the acquisition and possession of books | - |
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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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| bibliopolist | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopole |
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| bibliothec | (noun) a professional person trained in library science and engaged in library services | Synonyms: librarian |
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| bibliotheca | (noun) a collection of books | - |
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| bibliotics | (noun) the scientific study of documents and handwriting etc. especially to determine authorship or authenticity | - |
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| bibliotist | (noun) someone who engages in bibliotics | - |
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| 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 |