| bacchanalian | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchic, carousing, orgiastic |
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| bacterial | (adjective) relating to or caused by bacteria | - |
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| bactericidal | (adjective) preventing infection by inhibiting the growth or action of microorganisms | Synonyms: disinfectant, germicidal |
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| bacterioidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacteroid, bacteroidal |
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| bacteriological | (adjective) of or relating to bacteriology | Synonyms: bacteriologic |
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| bacteroidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroid |
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| balanced | (adjective) being in a state of proper equilibrium | - |
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| balconied | (adjective) having balconies or a balcony | - |
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| bald | (adjective) without the natural or usual covering | Synonyms: denudate, denuded |
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| (adjective) lacking hair on all or most of the scalp | Synonyms: bald-headed, bald-pated |
| (adjective) with no effort to conceal | Synonyms: barefaced |
| balding | (adjective) getting bald | - |
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| baleful | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: forbidding, menacing, minacious, minatory, ominous, sinister, threatening |
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| (adjective) deadly or sinister | Synonyms: baneful |
| balking | (adjective) refusing to proceed, act or work | Synonyms: balky |
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| balky | (adjective) refusing to proceed, act or work | Synonyms: balking |
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| balletic | (adjective) characteristic of or resembling or suitable for ballet | - |
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| ballistic | (adjective) relating to or characteristic of the motion of objects moving under their own momentum and the force of gravity | - |
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| bally | (adjective) informal intensifiers | Synonyms: blinking, bloody, blooming, crashing, flaming, fucking |
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| balmy | (adjective) mild and pleasant | Synonyms: mild, soft |
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| (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
| balsamic | (adjective) of or relating to or containing balsam | Synonyms: balsamy |
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| balsamy | (adjective) of or relating to or containing balsam | Synonyms: balsamic |
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| banal | (adjective) repeated too often; overfamiliar through overuse | Synonyms: commonplace, hackneyed, old-hat, shopworn, stock, threadbare, timeworn, tired, trite, well-worn |
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| baptismal | (adjective) of or relating to baptism | - |
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| barometrical | (adjective) relating to atmospheric pressure or indicated by a barometer | Synonyms: barometric |
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| baronial | (adjective) impressive in size, manner, or appearance | Synonyms: imposing, noble, stately |
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| basal | (adjective) especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem | Synonyms: radical |
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| (adjective) serving as or forming a base | Synonyms: base |
| (adjective) of or being the essential or basic part | Synonyms: elemental, elementary, primary |
| basaltic | (adjective) of or relating to or containing basalt | - |
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| basidial | (adjective) relating to or characterized by basidia | - |
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| basinal | (adjective) of or relating to a basin | - |
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| basipetal | (adjective) of leaves or flowers; developing or opening in succession from apex to base | - |
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| bathyal | (adjective) relating to ocean depths between 200 and 2000 meters (corresponds to the continental slope) | - |
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| bathymetrical | (adjective) of or relating to measurements of the depths of oceans or lakes | Synonyms: bathymetric |
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| becalmed | (adjective) rendered motionless for lack of wind | - |
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| behavioral | (adjective) of or relating to behavior | Synonyms: behavioural |
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| behavioural | (adjective) of or relating to behavior | Synonyms: behavioral |
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| beneficial | (adjective) promoting or enhancing well-being | Synonyms: good |
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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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| bestial | (adjective) resembling a beast; showing lack of human sensibility | Synonyms: beastly, brutal, brute, brutish |
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| biannual | (adjective) occurring or payable twice each year | Synonyms: biyearly, half-yearly, semiannual |
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| biaural | (adjective) relating to or having or hearing with two ears | Synonyms: binaural |
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| biaxal | (adjective) having two axes | Synonyms: biaxate, biaxial |
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| biaxial | (adjective) having two axes | Synonyms: biaxal, biaxate |
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| biblical | (adjective) of or pertaining to or contained in or in accordance with the Bible | Synonyms: scriptural |
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| (adjective) in keeping with the nature of the Bible or its times or people | - |
| bibliographical | (adjective) relating to or dealing with bibliography | Synonyms: bibliographic |
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| bibliomaniacal | (adjective) characteristic of or characterized by or noted for bibliomania | - |
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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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| bicameral | (adjective) composed of two legislative bodies | - |
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| (adjective) consisting of two chambers | Synonyms: two-chambered |
| bicentennial | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentenary |
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| bicephalous | (adjective) having two heads | - |
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| bicipital | (adjective) having two heads or points of origin as a biceps | - |
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| bicylindrical | (adjective) having two cylindrical surfaces usually with parallel axes | - |
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| bidirectional | (adjective) reactive or functioning or allowing movement in two usually opposite directions | - |
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| biennial | (adjective) having a life cycle lasting two seasons | Synonyms: two-year |
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| (adjective) occurring every second year | Synonyms: biyearly |
| bifacial | (adjective) having two faces or fronts | Synonyms: biface |
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| bifocal | (adjective) having two foci | - |
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| bigeminal | (adjective) occurring in pairs | - |
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| bilabial | (adjective) of or relating to or being a speech sound that is articulated using both lips | - |
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| bilateral | (adjective) having two sides or parts | Synonyms: two-sided |
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| (adjective) affecting or undertaken by two parties | - |
| (adjective) having identical parts on each side of an axis | Synonyms: bilaterally symmetric, bilaterally symmetrical, isobilateral |
| bilingual | (adjective) using or knowing two languages | - |
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| bimanual | (adjective) requiring two hands or designed for two people | Synonyms: two-handed |
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| bimestrial | (adjective) two months long; lasting two months | - |
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| (adjective) occurring every two months | Synonyms: bimonthly |
| bimetal | (adjective) formed of two different metals or alloys; especially in sheets bonded together | Synonyms: bimetallic |
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| bimetallic | (adjective) pertaining to a monetary system based on two metals | Synonyms: bimetallistic |
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| (adjective) formed of two different metals or alloys; especially in sheets bonded together | Synonyms: bimetal |
| bimetallistic | (adjective) pertaining to a monetary system based on two metals | Synonyms: bimetallic |
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| bimillenial | (adjective) of or relating to a bimillennium | - |
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| bimodal | (adjective) of a distribution; having or occurring with two modes | - |
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| binaural | (adjective) relating to or having or hearing with two ears | Synonyms: biaural |
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| binomial | (adjective) of or relating to or consisting of two terms | - |
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| (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binominal |
| binominal | (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binomial |
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| biocatalytic | (adjective) of or relating to biocatalysts | - |
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| biochemical | (adjective) of or relating to biochemistry; involving chemical processes in living organisms | - |
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| biogeographical | (adjective) of or relating to or involved with biogeography | Synonyms: biogeographic |
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| biographical | (adjective) of or relating to or being biography | Synonyms: biographic |
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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 |
| biomedical | (adjective) relating to the activities and applications of science to clinical medicine | - |
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| bionomical | (adjective) of or relating to the science of ecology | Synonyms: bionomic, ecologic, ecological |
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| bipedal | (adjective) having two feet | Synonyms: biped, two-footed |
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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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| bisectional | (adjective) of or relating to bisection | - |
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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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| 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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| bizonal | (adjective) relating to or concerned with the combined affairs of two administrative zones | - |
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| blastemal | (adjective) of or relating to blastemata | Synonyms: blastematic, blastemic |
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| blastoporal | (adjective) of or relating to a blastopore | Synonyms: blastoporic |
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| boreal | (adjective) toward or located in the north | - |
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| (adjective) relating to or marked by qualities associated with the north wind | - |
| (adjective) comprising or throughout far northern regions | Synonyms: circumboreal |
| botanical | (adjective) of or relating to plants or botany | Synonyms: botanic |
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| botryoidal | (adjective) resembling a cluster of grapes in form | Synonyms: botryoid, boytrose |
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| botulinal | (adjective) of or relating to or produced by the botulinus | - |
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| brachial | (adjective) of or relating to an arm | - |
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| brachycephalic | (adjective) having a short broad head with a cephalic index of over 80 | Synonyms: brachycranial, brachycranic |
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| brachycranial | (adjective) having a short broad head with a cephalic index of over 80 | Synonyms: brachycephalic, brachycranic |
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| bracteal | (adjective) pertaining to or resembling or functioning as a bract | - |
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| brahminical | (adjective) of or relating to or characteristic of a brahmin | Synonyms: brahminic |
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| braless | (adjective) having the breasts uncovered or featuring such nudity | Synonyms: bare-breasted, topless |
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| branchial | (adjective) of or relating to gills (or to parts of the body derived from embryonic gills) | - |
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| bridal | (adjective) of or pertaining to a bride | - |
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| (adjective) of or relating to a wedding | Synonyms: nuptial, spousal |
| bronchial | (adjective) relating to or associated with the bronchi | - |
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