| biologic | (adjective) pertaining to biology or to life and living things | Synonyms: biological |
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| biological | (adjective) (of a parent or child) related by blood; genetically related | Synonyms: natural |
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| (adjective) pertaining to biology or to life and living things | Synonyms: biologic |
| biologistic | (adjective) of or relating to biologism | - |
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| bioluminescent | (adjective) (of living organisms) emitting light | - |
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| biomedical | (adjective) relating to the activities and applications of science to clinical medicine | - |
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| bionic | (adjective) of or relating to bionics | - |
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| (adjective) having particular physiological functions augmented or replaced by electronic or electromechanical components | - |
| bionomic | (adjective) of or relating to the science of ecology | Synonyms: bionomical, ecologic, ecological |
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| bionomical | (adjective) of or relating to the science of ecology | Synonyms: bionomic, ecologic, ecological |
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| biosynthetic | (adjective) of or relating to biosynthesis | - |
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| biosystematic | (adjective) of or relating to biosystematics | - |
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| biotic | (adjective) of or relating to living organisms | - |
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| biotitic | (adjective) relating to or involving biotite | - |
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| biotypic | (adjective) of or relating to a biotype | - |
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| biovular | (adjective) (of twins) derived from two separate fertilized ova | Synonyms: fraternal |
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| biparous | (adjective) producing two offspring at a time | Synonyms: twinning |
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| bipartisan | (adjective) supported by both sides | Synonyms: bipartizan, two-party, two-way |
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| bipartite | (adjective) divided into two portions almost to the base | - |
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| (adjective) involving two parts or elements | Synonyms: two-part, two-way |
| bipartizan | (adjective) supported by both sides | Synonyms: bipartisan, two-party, two-way |
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| biped | (adjective) having two feet | Synonyms: bipedal, two-footed |
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| bipedal | (adjective) having two feet | Synonyms: biped, two-footed |
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| bipinnate | (adjective) of a leaf shape; having doubly pinnate leaflets (as ferns) | - |
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| bipinnatifid | (adjective) pinnatifid with the segments also pinnatifid | - |
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| bipolar | (adjective) having two poles | - |
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| (adjective) of, pertaining to, or occurring in both polar regions | - |
| (adjective) of or relating to manic depressive illness | - |
| biquadratic | (adjective) involving the fourth and no higher power of a quantity or degree | - |
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| biracial | (adjective) consisting of or combining two races | - |
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| biradial | (adjective) showing both bilateral and radial symmetry | - |
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| biramous | (adjective) resembling a fork; divided or separated into two branches | Synonyms: bifurcate, branched, forficate, fork-like, forked, pronged, prongy |
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| birch | (adjective) consisting of or made of wood of the birch tree | Synonyms: birchen, birken |
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| birchen | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birken |
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| birefringent | (adjective) relating to or characterized by double refraction | - |
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| birken | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birchen |
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| bisectional | (adjective) of or relating to bisection | - |
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| biserrate | (adjective) having saw-like notches with the notches themselves similarly notched | - |
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| bisexual | (adjective) sexually attracted to both sexes | - |
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| (adjective) having an ambiguous sexual identity | Synonyms: epicene |
| bismuthal | (adjective) of or relating to bismuth | - |
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| bismuthic | (adjective) containing bismuth (especially in the pentavalent state) | - |
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| bisontine | (adjective) relating to or characteristic of bison | - |
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| bistered | (adjective) colored with or as if with bister | Synonyms: bistred |
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| bistred | (adjective) colored with or as if with bister | Synonyms: bistered |
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| bistroic | (adjective) of or relating to or resembling a bistro | - |
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| bisulcate | (adjective) (used of hooves) split, divided | Synonyms: cloven |
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| bitchy | (adjective) marked by or arising from malice | Synonyms: cattish, catty |
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| bitey | (adjective) Having a tendency to bite aggressively | - |
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| biting | (adjective) causing a sharply painful or stinging sensation; used especially of cold | Synonyms: bitter |
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| (adjective) capable of wounding | Synonyms: barbed, mordacious, nipping, pungent |
| bitter | (adjective) proceeding from or exhibiting great hostility or animosity | - |
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| (adjective) very difficult to accept or bear | - |
| (adjective) causing a sharply painful or stinging sensation; used especially of cold | Synonyms: biting |
| (adjective) marked by strong resentment or cynicism | Synonyms: acrimonious |
| (adjective) expressive of severe grief or regret | - |
| (adjective) causing a sharp and acrid taste experience | - |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| bitterish | (adjective) somewhat bitter | Synonyms: sharp-tasting |
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| bittersweet | (adjective) tinged with sadness | - |
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| (adjective) having a taste that is a mixture of bitterness and sweetness | Synonyms: semisweet |
| bittie | (adjective) (used informally) little or tiny | Synonyms: bitty, itsy-bitsy, itty-bitty, teensy-weensy, teensy, teentsy, teeny-weeny, teeny, wee, weensy, weeny |
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| bitty | (adjective) (used informally) little or tiny | Synonyms: bittie, itsy-bitsy, itty-bitty, teensy-weensy, teensy, teentsy, teeny-weeny, teeny, wee, weensy, weeny |
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| bitumenoid | (adjective) like bitumen | Synonyms: bituminoid |
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| bituminoid | (adjective) like bitumen | Synonyms: bitumenoid |
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| bituminous | (adjective) resembling or containing bitumen | - |
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| bivalent | (adjective) used of homologous chromosomes associated in pairs in synapsis | Synonyms: double |
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| (adjective) having a valence of two or having two valences | Synonyms: divalent |
| bivalve | (adjective) used of mollusks having two shells (as clams etc.) | Synonyms: bivalved |
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| bivalved | (adjective) used of mollusks having two shells (as clams etc.) | Synonyms: bivalve |
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| bivariate | (adjective) having two variables | - |
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| biweekly | (adjective) occurring every two weeks | Synonyms: fortnightly |
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| (adjective) occurring twice a week | Synonyms: semiweekly |
| biyearly | (adjective) occurring or payable twice each year | Synonyms: biannual, half-yearly, semiannual |
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| (adjective) occurring every second year | Synonyms: biennial |
| bizarre | (adjective) conspicuously or grossly unconventional or unusual | Synonyms: eccentric, flakey, flaky, freakish, freaky, gonzo, off-the-wall, outlandish, outre |
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| bizonal | (adjective) relating to or concerned with the combined affairs of two administrative zones | - |
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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 |
| blabby | (adjective) unwisely talking too much | Synonyms: bigmouthed, blabbermouthed, talkative |
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| black | (adjective) being of the achromatic color of maximum darkness; having little or no hue owing to absorption of almost all incident light | - |
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| (adjective) of or belonging to a racial group especially of sub-Saharan African origin | - |
| (adjective) marked by anger or resentment or hostility | - |
| (adjective) (of the face) made black especially as with suffused blood | Synonyms: blackened |
| (adjective) (of intelligence operations) deliberately misleading | - |
| (adjective) extremely dark | Synonyms: pitch-black, pitch-dark |
| (adjective) soiled with dirt or soot | Synonyms: smutty |
| (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: disgraceful, ignominious, inglorious, opprobrious, shameful |
| (adjective) stemming from evil characteristics or forces; wicked or dishonorable | Synonyms: dark, sinister |
| (adjective) offering little or no hope | Synonyms: bleak, dim |
| (adjective) distributed or sold illicitly | Synonyms: black-market, bootleg, contraband, smuggled |
| (adjective) harshly ironic or sinister | Synonyms: grim, mordant |
| (adjective) (of coffee) without cream or sugar | - |
| (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: calamitous, disastrous, fatal, fateful |
| blackened | (adjective) (of the face) made black especially as with suffused blood | Synonyms: black |
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| (adjective) darkened by smoke | - |
| blackguardly | (adjective) lacking principles or scruples | Synonyms: rascally, roguish, scoundrelly |
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| blackish | (adjective) of something that is somewhat black | - |
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| bladderlike | (adjective) resembling a bladder | Synonyms: bladdery |
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| bladdery | (adjective) resembling a bladder | Synonyms: bladderlike |
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| bladed | (adjective) bearing or characterized by a blade or sword; often used in combination | - |
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| (adjective) having a blade or blades; often used in combination | - |
| (adjective) composed of thin flat plates resembling a knife blade | - |
| bladelike | (adjective) shaped like a sword blade | Synonyms: ensiform, sword-shaped, swordlike |
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| blae | (adjective) of bluish-black or grey-blue | - |
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| blamable | (adjective) deserving blame or censure as being wrong or evil or injurious | Synonyms: blameable, blameful, blameworthy, censurable, culpable |
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| blame | (adjective) expletives used informally as intensifiers | Synonyms: blamed, blasted, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned, infernal |
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| blameable | (adjective) deserving blame or censure as being wrong or evil or injurious | Synonyms: blamable, blameful, blameworthy, censurable, culpable |
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| blamed | (adjective) expletives used informally as intensifiers | Synonyms: blame, blasted, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned, infernal |
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| blameful | (adjective) deserving blame or censure as being wrong or evil or injurious | Synonyms: blamable, blameable, blameworthy, censurable, culpable |
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| blameless | (adjective) free of guilt; not subject to blame | Synonyms: inculpable, irreproachable, unimpeachable |
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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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| blanched | (adjective) anemic looking from illness or emotion | Synonyms: ashen, bloodless, livid, white |
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| (adjective) (especially of plants) developed without chlorophyll by being deprived of light | Synonyms: etiolate, etiolated |
| bland | (adjective) smoothly agreeable and courteous with a degree of sophistication | Synonyms: politic, smooth, suave |
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| (adjective) lacking taste or flavor or tang | Synonyms: flat, flavorless, flavourless, insipid, savorless, savourless, vapid |
| (adjective) lacking stimulating characteristics; uninteresting | Synonyms: flat |
| blank | (adjective) (of a surface) not written or printed on | Synonyms: clean, white |
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| (adjective) not charged with a bullet | - |
| (adjective) complete and absolute | Synonyms: utter |
| (adjective) without comprehension | - |
| blanket | (adjective) broad in scope or content | Synonyms: across-the-board, all-embracing, all-encompassing, all-inclusive, broad, encompassing, extensive, panoptic, wide |
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| blanketed | (adjective) covered with (or as if with) a blanket | - |
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| blaring | (adjective) unpleasantly loud and penetrating | Synonyms: blasting |
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| blase | (adjective) very sophisticated especially because of surfeit; versed in the ways of the world | Synonyms: worldly |
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| (adjective) nonchalantly unconcerned | - |
| (adjective) uninterested because of frequent exposure or indulgence | Synonyms: bored |
| blasphemous | (adjective) characterized by profanity or cursing | Synonyms: blue, profane |
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| (adjective) grossly irreverent toward what is held to be sacred | Synonyms: profane, sacrilegious |
| blasted | (adjective) expletives used informally as intensifiers | Synonyms: blame, blamed, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned, infernal |
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| blastemal | (adjective) of or relating to blastemata | Synonyms: blastematic, blastemic |
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| blastematic | (adjective) of or relating to blastemata | Synonyms: blastemal, blastemic |
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| blastemic | (adjective) of or relating to blastemata | Synonyms: blastemal, blastematic |
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| blasting | (adjective) causing injury or blight; especially affecting with sudden violence or plague or ruin | Synonyms: ruinous |
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| (adjective) unpleasantly loud and penetrating | Synonyms: blaring |
| blastocoelic | (adjective) of or relating to a segmentation cavity | - |
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| blastodermatic | (adjective) of or relating to a blastoderm | Synonyms: blastodermic |
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| blastodermic | (adjective) of or relating to a blastoderm | Synonyms: blastodermatic |
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| blastogenetic | (adjective) of or relating to blastogenesis | - |
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| blastomeric | (adjective) of or relating to a blastomere | - |
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| blastomycotic | (adjective) of or relating to or characteristic of blastomycosis | - |
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| blastoporal | (adjective) of or relating to a blastopore | Synonyms: blastoporic |
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| blastoporic | (adjective) of or relating to a blastopore | Synonyms: blastoporal |
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| blastospheric | (adjective) of or relating to a blastula | Synonyms: blastular |
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