| 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 |
| (noun) (botany) a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season | - |
| 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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| (noun) a consonant that is articulated using both lips; /p/ or /b/ or /w/ | - |
| 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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| (noun) a person who speaks two languages fluently | Synonyms: bilingualist |
| 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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| (noun) material made by bonding together sheets of two different metals | - |
| 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 |
| (noun) (mathematics) a quantity expressed as a sum or difference of two terms; a polynomial with two terms | - |
| binominal | (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binomial |
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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 |
| (noun) a person who is sexually attracted to both sexes | Synonyms: bisexual person |
| bismuthal | (adjective) of or relating to bismuth | - |
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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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| bonemeal | (noun) fertilizer made of ground bones | - |
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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 |
| borstal | (noun) formerly a British reform school for youths considered too young to send to prison | - |
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| botanical | (adjective) of or relating to plants or botany | Synonyms: botanic |
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| (noun) a drug made from part of a plant (as the bark or root or leaves) | - |
| 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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| 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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| 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 |
| (noun) archaic terms for a wedding or wedding feast | Synonyms: espousal |
| brinjal | (noun) hairy upright herb native to southeastern Asia but widely cultivated for its large glossy edible fruit commonly used as a vegetable | Synonyms: aubergine, eggplant, eggplant bush, garden egg, mad apple, Solanum melongena |
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| bronchial | (adjective) relating to or associated with the bronchi | - |
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| brumal | (adjective) characteristic of or relating to winter | Synonyms: hibernal, hiemal |
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| brutal | (adjective) disagreeably direct and precise | - |
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| (adjective) resembling a beast; showing lack of human sensibility | Synonyms: beastly, bestial, brute, brutish |
| (adjective) punishingly harsh | Synonyms: unrelenting |
| (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: barbarous, cruel, fell, roughshod, savage, vicious |
| buccal | (adjective) of or involving the mouth or mouth region or the surface on which the mouth is located | Synonyms: oral |
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| (adjective) of or relating to or toward the cheek | - |
| buntal | (noun) fine white Philippine fiber from stalks of unopened leaves of talipot palms; used in making hats | - |
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| burial | (noun) concealing something under the ground | Synonyms: burying |
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| (noun) the ritual placing of a corpse in a grave | Synonyms: entombment, inhumation, interment, sepulture |
| bursal | (adjective) relating to or affecting a bursa | - |
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| cabal | (noun) a plot to carry out some harmful or illegal act (especially a political plot) | Synonyms: conspiracy |
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| (noun) a clique (often secret) that seeks power usually through intrigue | Synonyms: camarilla, faction, junto |
| (verb) engage in plotting or enter into a conspiracy, swear together | Synonyms: complot, conjure, conspire, machinate |
| cacuminal | (adjective) pronounced with the tip of the tongue turned back toward the hard palate | Synonyms: retroflex |
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| cadastral | (adjective) of or relating to the records of a cadastre | - |
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| caecal | (adjective) of or like a cecum | Synonyms: cecal |
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| caesural | (adjective) of or relating to a caesura | - |
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| calcaneal | (adjective) relating to the heel bone or heel | - |
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| calendrical | (adjective) relating to or characteristic of or used in a calendar or time measurement | Synonyms: calendric |
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| calligraphical | (adjective) of or relating to or expressed in calligraphy | Synonyms: calligraphic |
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| calyceal | (adjective) of or relating to or resembling a calyx | Synonyms: calycinal, calycine |
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| calycinal | (adjective) of or relating to or resembling a calyx | Synonyms: calyceal, calycine |
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| cambial | (adjective) of or relating to or functioning as a cambium | - |
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| campestral | (adjective) of fields or open country | - |
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| canal | (noun) long and narrow strip of water made for boats or for irrigation | - |
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| (noun) a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance | Synonyms: channel, duct, epithelial duct |
| (noun) (astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion | - |
| (verb) provide (a city) with a canal | Synonyms: canalise, canalize |
| cannibal | (noun) a person who eats human flesh | Synonyms: anthropophagite, anthropophagus, man-eater |
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| canonical | (adjective) of or relating to or required by canon law | Synonyms: canonic |
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| (adjective) appearing in a biblical canon | Synonyms: canonic |
| (adjective) conforming to orthodox or recognized rules | Synonyms: canonic, sanctioned |
| (adjective) reduced to the simplest and most significant form possible without loss of generality | Synonyms: basic, canonic |
| cantonal | (adjective) of or relating to a canton | - |
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| capital | (adjective) of principal importance | - |
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| (adjective) first-rate | - |
| (adjective) uppercase | Synonyms: great, majuscule |
| (noun) the upper part of a column that supports the entablature | Synonyms: cap, chapiter |
| (noun) one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis | Synonyms: capital letter, majuscule, upper-case letter, uppercase |
| (noun) a seat of government | - |
| (noun) a center that is associated more than any other with some activity or product | - |
| (noun) wealth in the form of money or property owned by a person or business and human resources of economic value | - |
| (noun) assets available for use in the production of further assets | Synonyms: working capital |
| caracal | (noun) of deserts of northern Africa and southern Asia | Synonyms: desert lynx, Lynx caracal |
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| cardinal | (adjective) being or denoting a numerical quantity but not order | - |
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| (adjective) serving as an essential component | Synonyms: central, fundamental, key, primal |
| (noun) crested thick-billed North American finch having bright red plumage in the male | Synonyms: cardinal grosbeak, Cardinalis cardinalis, redbird, Richmondena Cardinalis |
| (noun) a variable color averaging a vivid red | Synonyms: carmine |
| (noun) (Roman Catholic Church) one of a group of more than 100 prominent bishops in the Sacred College who advise the Pope and elect new Popes | - |
| (noun) the number of elements in a mathematical set; denotes a quantity but not the order | Synonyms: cardinal number |
| carinal | (adjective) relating to or resembling a carina | - |
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| carnal | (adjective) of or relating to the body or flesh | - |
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| (adjective) marked by the appetites and passions of the body | Synonyms: animal, fleshly, sensual |
| carnassial | (adjective) (of a tooth) adapted for shearing flesh | - |
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| carnival | (noun) a festival marked by merrymaking and processions | - |
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| (noun) a traveling show; having sideshows and rides and games of skill etc. | Synonyms: fair, funfair |
| (noun) a frenetic disorganized (and often comic) disturbance suggestive of a large public entertainment | Synonyms: circus |
| carousal | (noun) revelry in drinking; a merry drinking party | Synonyms: bender, booze-up, carouse, toot |
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| carpal | (adjective) of or relating to the wrist | - |
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| (noun) any of the eight small bones of the wrist of primates | Synonyms: carpal bone, wrist bone |
| cartographical | (adjective) of or relating to the making of maps or charts | Synonyms: cartographic |
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| casual | (adjective) hasty and without attention to detail; not thorough | Synonyms: cursory, passing, perfunctory, superficial |
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| (adjective) not showing effort or strain | Synonyms: effortless |
| (adjective) occurring on a temporary or irregular basis | Synonyms: occasional |
| (adjective) marked by blithe unconcern | Synonyms: insouciant, nonchalant |
| (adjective) appropriate for ordinary or routine occasions | Synonyms: daily, everyday |
| (adjective) occurring or appearing or singled out by chance | Synonyms: chance |
| (adjective) natural and unstudied | Synonyms: free-and-easy |
| (adjective) characterized by a feeling of irresponsibility | Synonyms: fooling |
| (adjective) without or seeming to be without plan or method; offhand | - |
| casuistical | (adjective) of or relating to the use of ethical principles to resolve moral problems | Synonyms: casuistic |
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| (adjective) of or relating to or practicing casuistry | Synonyms: casuistic |
| catachrestical | (adjective) constituting or characterized by or given to catachresis | Synonyms: catachrestic |
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| cataclinal | (adjective) of valleys and rivers; running in the direction of the dip in surrounding rock strata | - |
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| cataclysmal | (adjective) severely destructive | Synonyms: cataclysmic |
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| catamenial | (adjective) of or relating to menstruation or the menses | Synonyms: menstrual |
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| catarrhal | (adjective) of or relating to a catarrh | - |
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| catechetical | (adjective) of or relating to or involving catechesis | Synonyms: catechetic |
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| catechismal | (adjective) of or relating to a catechism summarizing the principles of Christianity | - |
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| categorial | (adjective) of or relating to the concept of categories | - |
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| categorical | (adjective) relating to or included in a category or categories | Synonyms: categoric |
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| (adjective) not modified or restricted by reservations | Synonyms: categoric, flat, unconditional |
| cathedral | (adjective) relating to or containing or issuing from a bishop's office or throne | - |
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| (noun) any large and important church | - |
| (noun) the principal Christian church building of a bishop's diocese | Synonyms: duomo |
| catoptrical | (adjective) of or relating to catoptrics; produced by or based on mirrors | Synonyms: catoptric |
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| caudal | (adjective) constituting or relating to a tail | - |
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| (adjective) resembling a tail | Synonyms: taillike |
| (adjective) situated in or directed toward the part of the body from which the tail arises | - |
| (adverb) toward the posterior end of the body | Synonyms: caudally |
| causal | (adjective) involving or constituting a cause; causing | - |
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| cecal | (adjective) of or like a cecum | Synonyms: caecal |
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| celestial | (adjective) relating to or inhabiting a divine heaven | Synonyms: heavenly |
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| (adjective) of or relating to the sky | Synonyms: heavenly |
| (adjective) of heaven or the spirit | Synonyms: ethereal, supernal |
| cenobitical | (adjective) of or relating to or befitting cenobites or their practices of communal living | Synonyms: cenobitic, coenobitic, coenobitical |
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| censorial | (adjective) belonging or relating to a censor or a censor's functions | - |
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| cental | (noun) a United States unit of weight equivalent to 100 pounds | Synonyms: centner, cwt, hundredweight, quintal, short hundredweight |
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| centennial | (adjective) of or relating to or completing a period of 100 years | Synonyms: centenary |
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| (noun) the 100th anniversary (or the celebration of it) | Synonyms: centenary |
| centesimal | (adjective) relating to or divided into hundredths | - |
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| (adjective) the ordinal number of one hundred in counting order | Synonyms: 100th, hundredth |
| central | (adjective) in or near a center or constituting a center; the inner area | - |
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| (adjective) serving as an essential component | Synonyms: cardinal, fundamental, key, primal |
| (noun) a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication | Synonyms: exchange, telephone exchange |