| bathyscaph | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaphe |
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| bathyscaphe | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaph |
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| bathysphere | (noun) spherical deep diving apparatus (lowered by a cable) for underwater exploration | - |
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| bedclothes | (noun) coverings that are used on a bed | Synonyms: bed clothing, bedding |
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| behemoth | (noun) someone that is abnormally large and powerful | Synonyms: colossus, giant, goliath, monster |
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| (noun) a person of exceptional importance and reputation | Synonyms: colossus, giant, heavyweight, titan |
| bellwether | (noun) sheep that leads the herd often wearing a bell | - |
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| (noun) someone who assumes leadership of a movement or activity | - |
| beneath | (adverb) in or to a place that is lower | Synonyms: at a lower place, below, to a lower place |
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| benthal | (adjective) of or relating to or happening on the bottom under a body of water | Synonyms: benthic, benthonic |
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| benthic | (adjective) of or relating to or happening on the bottom under a body of water | Synonyms: benthal, benthonic |
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| benthonic | (adjective) of or relating to or happening on the bottom under a body of water | Synonyms: benthal, benthic |
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| benthos | (noun) organisms (plants and animals) that live at or near the bottom of a sea, lake, river or stream | - |
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| (noun) a region including the bottom of the sea and the littoral zones | Synonyms: benthic division, benthonic zone |
| bequeath | (verb) leave or give by will after one's death | Synonyms: leave, will |
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| berth | (noun) a job in an organization | Synonyms: office, place, position, post, situation |
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| (noun) a bed on a ship or train; usually in tiers | Synonyms: built in bed, bunk |
| (noun) a place where a craft can be made fast | Synonyms: moorage, mooring, slip |
| (verb) secure in or as if in a berth or dock | Synonyms: moor, tie up |
| (verb) come into or dock at a wharf | Synonyms: moor, wharf |
| (verb) provide with a berth | - |
| beth | (noun) the 2nd letter of the Hebrew alphabet | - |
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| bethel | (noun) a house of worship (especially one for sailors) | - |
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| bethink | (verb) consider or ponder something carefully | - |
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| (verb) cause oneself to consider something | - |
| betroth | (verb) give to in marriage | Synonyms: affiance, engage, plight |
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| betrothal | (noun) the act of becoming betrothed or engaged | Synonyms: espousal |
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| (noun) a mutual promise to marry | Synonyms: engagement, troth |
| betrothed | (adjective) pledged to be married | Synonyms: bespoken, engaged |
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| (noun) the person to whom you are engaged | - |
| 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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| bibliothecal | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecarial |
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| bibliothecarial | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecal |
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| bigmouthed | (adjective) unwisely talking too much | Synonyms: blabbermouthed, blabby, talkative |
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| billionth | (adjective) the ordinal number of one billion in counting order | - |
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| (noun) one part in a billion equal parts | Synonyms: one-billionth |
| (noun) position 1,000,000,000 in a countable series of things | - |
| bimonthly | (adjective) occurring every two months | Synonyms: bimestrial |
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| (adjective) occurring twice a month | Synonyms: semimonthly |
| (noun) a periodical that is published twice a month or every two months (either 24 or 6 issues per year) | - |
| (adverb) every two months | - |
| (adverb) twice a month | Synonyms: semimonthly |
| bioethics | (noun) the branch of ethics that studies moral values in the biomedical sciences | - |
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| biosynthesis | (noun) production of a chemical compound by a living organism | Synonyms: biogenesis |
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| biosynthetic | (adjective) of or relating to biosynthesis | - |
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| birdbath | (noun) an ornamental basin (usually in a garden) for birds to bathe in | - |
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| birth | (noun) the event of being born | Synonyms: nascence, nascency, nativity |
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| (noun) a baby born; an offspring | - |
| (noun) the process of giving birth | Synonyms: birthing, giving birth, parturition |
| (noun) the kinship relation of an offspring to the parents | Synonyms: parentage |
| (noun) the time when something begins (especially life) | - |
| (verb) cause to be born | Synonyms: bear, deliver, give birth, have |
| birthday | (noun) an anniversary of the day on which a person was born (or the celebration of it) | - |
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| (noun) the date on which a person was born | Synonyms: natal day |
| birthing | (noun) the process of giving birth | Synonyms: birth, giving birth, parturition |
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| birthmark | (noun) a blemish on the skin that is formed before birth | Synonyms: nevus |
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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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| birthright | (noun) a right or privilege that you are entitled to at birth | - |
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| (noun) an inheritance coming by right of birth (especially by primogeniture) | Synonyms: patrimony |
| birthroot | (noun) trillium of eastern North America having malodorous pink to purple flowers and an astringent root used in folk medicine especially to ease childbirth | Synonyms: purple trillium, red trillium, Trillium erectum |
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| birthwort | (noun) creeping plant having curving flowers thought to resemble fetuses; native to Europe; naturalized Great Britain and eastern North America | Synonyms: Aristolochia clematitis |
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| bismuth | (noun) a heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically); usually recovered as a by-product from ores of other metals | Synonyms: atomic number 83, Bi |
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| bismuthal | (adjective) of or relating to bismuth | - |
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| bismuthic | (adjective) containing bismuth (especially in the pentavalent state) | - |
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| bitthead | (noun) the upper end of a bitt | - |
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| blabbermouth | (noun) someone who gossips indiscreetly | Synonyms: talebearer, taleteller, tattler, tattletale, telltale |
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| blabbermouthed | (adjective) prone to communicate confidential information | Synonyms: leaky, talebearing, tattling |
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| (adjective) unwisely talking too much | Synonyms: bigmouthed, blabby, talkative |
| blacksmith | (noun) a smith who forges and shapes iron with a hammer and anvil | - |
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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 |
| blameworthiness | (noun) a state of guilt | Synonyms: culpability, culpableness |
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| blameworthy | (adjective) deserving blame or censure as being wrong or evil or injurious | Synonyms: blamable, blameable, blameful, censurable, culpable |
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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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| 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 |
| 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 | - |
| blithely | (adverb) in a joyous manner | Synonyms: gayly, happily, jubilantly, merrily, mirthfully |
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| blitheness | (noun) a feeling of spontaneous good spirits | Synonyms: cheerfulness |
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| blither | (verb) to talk foolishly | Synonyms: babble, blather, blether, smatter |
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| blithesome | (adjective) carefree and happy and lighthearted | Synonyms: blithe, light-hearted, lighthearted, lightsome |
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| bloodbath | (noun) indiscriminate slaughter | Synonyms: battue, bloodletting, bloodshed |
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| bloodthirstiness | (noun) a disposition to shed blood | Synonyms: bloodiness |
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| bloodthirsty | (adjective) marked by eagerness to resort to violence and bloodshed | Synonyms: bloody-minded, sanguinary |
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| bluethroat | (noun) songbird of northern Europe and Asia | Synonyms: Erithacus svecicus |
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| boathouse | (noun) a shed at the edge of a river or lake; used to store boats | - |
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| bonnethead | (noun) small harmless hammerhead having a spade-shaped head; abundant in bays and estuaries | Synonyms: bonnet shark, shovelhead, Sphyrna tiburo |
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| bookcloth | (noun) a woven fabric (usually cotton) used for book covers. | Synonyms: book cloth |
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| booth | (noun) small area set off by walls for special use | Synonyms: cubicle, kiosk, stall |
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| (noun) a small shop at a fair; for selling goods or entertainment | - |
| (noun) a table (in a restaurant or bar) surrounded by two high-backed benches | - |
| boothose | (noun) protective stockings worn with or in place of boots | - |
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| both | (adjective) (used with count nouns) two considered together; the two | - |
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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 |
| botheration | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, bother, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) the psychological state of being irritated or annoyed | Synonyms: annoyance, irritation, vexation |
| bothered | (adjective) caused to show discomposure | Synonyms: daunted, fazed |
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| bothersome | (adjective) causing irritation or annoyance | Synonyms: annoying, galling, irritating, nettlesome, pesky, pestering, pestiferous, plaguey, plaguy, teasing, vexatious, vexing |
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| boxthorn | (noun) any of various shrubs or vines of the genus Lycium with showy flowers and bright berries | Synonyms: matrimony vine |
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| breadth | (noun) the extent of something from side to side | Synonyms: width |
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| (noun) the capacity to understand a broad range of topics | Synonyms: comprehensiveness, largeness |
| breadthways | (adverb) in the direction of the breadth | Synonyms: breadthwise, broadwise |
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| breadthwise | (adverb) in the direction of the breadth | Synonyms: breadthways, broadwise |
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| breakthrough | (noun) a penetration of a barrier such as an enemy's defense | - |
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| (noun) making an important discovery | - |
| (noun) a productive insight | Synonyms: discovery, find |
| breath | (noun) the process of taking in and expelling air during breathing | - |
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| (noun) an indirect suggestion | Synonyms: hint, intimation |
| (noun) a slight movement of the air | - |
| (noun) the air that is inhaled and exhaled in respiration | - |
| (noun) a short respite | Synonyms: breather, breathing place, breathing space, breathing spell, breathing time |
| breathalyse | (verb) test someone's alcohol level in his blood by means of a breathalyzer | Synonyms: breathalyze |
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| breathalyser | (noun) a device that measures chemicals (especially the alcohol content) in a person's expired breath | Synonyms: breathalyzer |
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| breathalyze | (verb) test someone's alcohol level in his blood by means of a breathalyzer | Synonyms: breathalyse |
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| breathalyzer | (noun) a device that measures chemicals (especially the alcohol content) in a person's expired breath | Synonyms: breathalyser |
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| breathe | (verb) draw air into, and expel out of, the lungs | Synonyms: respire, suspire, take a breath |
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| (verb) expel (gases or odors) | Synonyms: emit, pass off |
| (verb) reach full flavor by absorbing air and being let to stand after having been uncorked | - |
| (verb) take a short break from one's activities in order to relax | Synonyms: catch one's breath, rest, take a breather |
| (verb) utter or tell | - |
| (verb) manifest or evince | - |
| (verb) impart as if by breathing | - |
| (verb) be alive | - |
| (verb) allow the passage of air through | - |
| breathed | (adjective) uttered without voice | Synonyms: voiceless |
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| breather | (noun) air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time | Synonyms: schnorchel, schnorkel, snorkel, snorkel breather |
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| (noun) a short respite | Synonyms: breath, breathing place, breathing space, breathing spell, breathing time |
| breathing | (adjective) passing or able to pass air in and out of the lungs normally; sometimes used in combination | Synonyms: eupneic, eupnoeic |
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| (noun) the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation | Synonyms: external respiration, respiration, ventilation |
| breathless | (adjective) not breathing or able to breathe except with difficulty | Synonyms: dyspneal, dyspneic, dyspnoeal, dyspnoeic |
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| (adjective) appearing dead; not breathing or having no perceptible pulse | Synonyms: inanimate, pulseless |
| (adjective) tending to cause suspension of regular breathing | Synonyms: breathtaking |
| breathlessly | (adverb) in a breathless manner | - |
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| breathlessness | (noun) a dyspneic condition | Synonyms: shortness of breath, SOB |
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| breathtaking | (adjective) tending to cause suspension of regular breathing | Synonyms: breathless |
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| breechcloth | (noun) a garment that provides covering for the loins | Synonyms: breechclout, loincloth |
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| brethren | (noun) (plural) the lay members of a male religious order | - |
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| broadcloth | (noun) a closely woven silk or synthetic fabric with a narrow crosswise rib | - |
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| (noun) a densely textured woolen fabric with a lustrous finish | - |
| broth | (noun) a thin soup of meat or fish or vegetable stock | - |
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| (noun) liquid in which meat and vegetables are simmered; used as a basis for e.g. soups or sauces | Synonyms: stock |
| brothel | (noun) a building where prostitutes are available | Synonyms: bagnio, bawdyhouse, bordello, cathouse, house of ill repute, house of prostitution, sporting house, whorehouse |
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| brother | (noun) a male with the same parents as someone else | Synonyms: blood brother |
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| (noun) a male person who is a fellow member (of a fraternity or religion or other group) | - |
| (noun) a close friend who accompanies his buddies in their activities | Synonyms: buddy, chum, crony, pal, sidekick |
| (noun) used as a term of address for those male persons engaged in the same movement | Synonyms: comrade |
| brotherhood | (noun) the feeling that men should treat one another like brothers | - |
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| (noun) people engaged in a particular occupation | Synonyms: fraternity, sodality |
| (noun) an organization of employees formed to bargain with the employer | Synonyms: labor union, trade union, trades union, union |
| (noun) the kinship relation between a male offspring and the siblings | - |
| brotherlike | (adjective) like or characteristic of or befitting a brother | Synonyms: brotherly, fraternal |
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| brotherly | (adjective) like or characteristic of or befitting a brother | Synonyms: brotherlike, fraternal |
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| (adverb) (archaic as adverb) in a manner characteristic of a brother | - |
| bryanthus | (noun) procumbent Old World mat-forming evergreen shrub with racemes of pinkish-white flowers | - |
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| buckthorn | (noun) any shrub or small tree of the genus Bumelia | - |
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| (noun) a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments | - |
| (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: English plantain, narrow-leaved plantain, Plantago lanceolata, ribgrass, ribwort, ripple-grass |