| biosystematic | (adjective) of or relating to biosystematics | - |
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| biosystematics | (noun) use of data (e.g. cytogenetic or biochemical) to assess taxonomic relations especially within an evolutionary framework | Synonyms: biosystematy |
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| biosystematy | (noun) use of data (e.g. cytogenetic or biochemical) to assess taxonomic relations especially within an evolutionary framework | Synonyms: biosystematics |
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| biota | (noun) all the plant and animal life of a particular region | Synonyms: biology |
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| biotech | (noun) the branch of molecular biology that studies the use of microorganisms to perform specific industrial processes | Synonyms: biotechnology |
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| biotechnology | (noun) the branch of engineering science in which biological science is used to study the relation between workers and their environments | Synonyms: bioengineering, ergonomics |
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| (noun) the branch of molecular biology that studies the use of microorganisms to perform specific industrial processes | Synonyms: biotech |
| bioterrorism | (noun) terrorism using the weapons of biological warfare | Synonyms: biological terrorism |
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| biotic | (adjective) of or relating to living organisms | - |
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| biotin | (noun) a B vitamin that aids in body growth | Synonyms: vitamin H |
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| biotite | (noun) dark brown to black mica found in igneous and metamorphic rock | - |
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| biotitic | (adjective) relating to or involving biotite | - |
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| biotype | (noun) organisms sharing a specified genotype or the genotype (or peculiarities) so shared | - |
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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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| bioweapon | (noun) any weapon usable in biological warfare | Synonyms: bioarm, biological weapon |
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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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| (noun) an animal with two feet | - |
| bipedal | (adjective) having two feet | Synonyms: biped, two-footed |
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| bipedalism | (noun) the bodily attribute of being bipedal; having two feet | - |
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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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| biplane | (noun) old fashioned airplane; has two wings one above the other | - |
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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 | - |
| biprism | (noun) an optical device for obtaining interference fringes | - |
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| biquadrate | (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadratic, fourth power, quartic |
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| biquadratic | (adjective) involving the fourth and no higher power of a quantity or degree | - |
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| (noun) a polynomial of the fourth degree | Synonyms: biquadratic polynomial, quartic polynomial |
| (noun) an equation of the fourth degree | Synonyms: biquadratic equation |
| (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadrate, fourth power, quartic |
| biracial | (adjective) consisting of or combining two races | - |
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| biradial | (adjective) showing both bilateral and radial symmetry | - |
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| biradially | (adverb) in a biradial manner | - |
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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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| (noun) a switch consisting of a twig or a bundle of twigs from a birch tree; used to hit people as punishment | Synonyms: birch rod |
| (noun) any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Synonyms: birch tree |
| (noun) hard close-grained wood of any of various birch trees; used especially in furniture and interior finishes and plywood | - |
| (verb) whip with a birch twig | - |
| birchbark | (noun) a canoe made with the bark of a birch tree | Synonyms: birch bark, birchbark canoe |
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| birchen | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birken |
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| bird | (noun) warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings | - |
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| (noun) badminton equipment consisting of a ball of cork or rubber with a crown of feathers | Synonyms: birdie, shuttle, shuttlecock |
| (noun) a cry or noise made to express displeasure or contempt | Synonyms: boo, Bronx cheer, hiss, hoot, raspberry, razz, razzing, snort |
| (noun) the flesh of a bird or fowl (wild or domestic) used as food | Synonyms: fowl |
| (noun) informal terms for a (young) woman | Synonyms: chick, dame, doll, skirt, wench |
| (verb) watch and study birds in their natural habitat | Synonyms: birdwatch |
| birdbath | (noun) an ornamental basin (usually in a garden) for birds to bathe in | - |
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| birdbrain | (noun) a person with confused ideas; incapable of serious thought | Synonyms: addle-head, addlehead, loon |
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| birdcage | (noun) a cage in which a bird can be kept | - |
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| birdcall | (noun) a device for imitating a birdcall | - |
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| (noun) the characteristic sound produced by a bird | Synonyms: birdsong, call, song |
| birder | (noun) a person who identifies and studies birds in their natural habitats | Synonyms: bird watcher |
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| birdfeeder | (noun) an outdoor device that supplies food for wild birds | Synonyms: bird feeder, feeder |
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| birdhouse | (noun) a shelter for birds | - |
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| birdie | (noun) badminton equipment consisting of a ball of cork or rubber with a crown of feathers | Synonyms: bird, shuttle, shuttlecock |
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| (noun) (golf) a score of one stroke under par on a hole | - |
| (verb) shoot in one stroke under par | - |
| birdlime | (noun) a sticky adhesive that is smeared on small branches to capture small birds | Synonyms: lime |
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| (verb) spread birdlime on branches to catch birds | Synonyms: lime |
| birdnest | (noun) nest where birds lay their eggs and hatch their young | Synonyms: bird's nest, bird nest |
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| (verb) gather birdnests | Synonyms: bird-nest |
| birdnesting | (noun) hunting for birds' nests to get the eggs | - |
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| birdseed | (noun) food given to birds; usually mixed seeds | Synonyms: bird feed, bird food |
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| birdsong | (noun) the characteristic sound produced by a bird | Synonyms: birdcall, call, song |
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| birdwatch | (verb) watch and study birds in their natural habitat | Synonyms: bird |
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| birefringence | (noun) splitting a ray into two parallel rays polarized perpendicularly | Synonyms: double refraction |
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| birefringent | (adjective) relating to or characterized by double refraction | - |
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| biretta | (noun) a stiff cap with ridges across the crown; worn by Roman Catholic clergy | Synonyms: berretta, birretta |
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| biriani | (noun) an Indian dish made with highly seasoned rice and meat or fish or vegetables | Synonyms: biryani |
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| birken | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birchen |
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| birl | (verb) cause to spin | Synonyms: spin, twirl, whirl |
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| (verb) cause a floating log to rotate by treading | Synonyms: birle |
| birle | (verb) cause a floating log to rotate by treading | Synonyms: birl |
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| birling | (noun) rotating a log rapidly in the water (as a competitive sport) | Synonyms: logrolling |
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| birr | (noun) the basic unit of money in Ethiopia; equal to 100 cents | - |
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| (noun) sound of something in rapid motion | Synonyms: whir, whirr, whirring |
| (verb) make a soft swishing sound | Synonyms: purr, whir, whirr, whiz, whizz |
| birretta | (noun) a stiff cap with ridges across the crown; worn by Roman Catholic clergy | Synonyms: berretta, biretta |
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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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| biryani | (noun) an Indian dish made with highly seasoned rice and meat or fish or vegetables | Synonyms: biriani |
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| biscuit | (noun) small round bread leavened with baking-powder or soda | - |
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| (noun) any of various small flat sweet cakes | Synonyms: cookie, cooky |
| bise | (noun) a dry cold north wind in southeastern France | Synonyms: bize |
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| bisect | (verb) cut in half or cut in two | - |
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| bisection | (noun) dividing into two equal parts | - |
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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 |
| (noun) a person who is sexually attracted to both sexes | Synonyms: bisexual person |
| bisexuality | (noun) sexual activity with both men and women | - |
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| (noun) showing characteristics of both sexes | Synonyms: androgyny, hermaphroditism |
| bishop | (noun) (chess) a piece that can be moved diagonally over unoccupied squares of the same color | - |
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| (noun) port wine mulled with oranges and cloves | - |
| (noun) a senior member of the Christian clergy having spiritual and administrative authority; appointed in Christian churches to oversee priests or ministers; considered in some churches to be successors of the twelve Apostles of Christ | - |
| bishopric | (noun) the territorial jurisdiction of a bishop | Synonyms: diocese, episcopate |
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| bishopry | (noun) the office and dignity of a bishop | Synonyms: episcopate |
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| bismark | (noun) a raised doughnut filled with jelly or jam | Synonyms: Berlin doughnut, jelly doughnut |
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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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| bison | (noun) any of several large humped bovids having shaggy manes and large heads and short horns | - |
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| bisontine | (adjective) relating to or characteristic of bison | - |
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| bispak | (noun) A sexually promiscuous Indonesian woman | - |
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| bisque | (noun) a thick cream soup made from shellfish | - |
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| bister | (noun) a water-soluble brownish-yellow pigment made by boiling wood soot | Synonyms: bistre |
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| bistered | (adjective) colored with or as if with bister | Synonyms: bistred |
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| bistre | (noun) a water-soluble brownish-yellow pigment made by boiling wood soot | Synonyms: bister |
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| bistred | (adjective) colored with or as if with bister | Synonyms: bistered |
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| bistro | (noun) a small informal restaurant; serves wine | - |
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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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| bisulfate | (noun) a salt or an ester of sulphuric acid with the chemical formula HSO4-. | Synonyms: hydrogen sulfate |
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| bit | (noun) the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press | - |
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| (noun) piece of metal held in horse's mouth by reins and used to control the horse while riding | - |
| (noun) the part of a key that enters a lock and lifts the tumblers | - |
| (noun) a short performance that is part of a longer program | Synonyms: act, number, routine, turn |
| (noun) a small fragment | Synonyms: snatch |
| (noun) an instance of some kind | Synonyms: piece |
| (noun) a small amount of solid food; a mouthful | Synonyms: bite, morsel |
| (noun) a small fragment of something broken off from the whole | Synonyms: chip, flake, fleck, scrap |
| (noun) a unit of measurement of information (from binary + digit); the amount of information in a system having two equiprobable states | - |
| (noun) a small piece or quantity of something | Synonyms: spot |
| (noun) an indefinitely short time | Synonyms: minute, mo, moment, second |
| bitartrate | (noun) an acid tartrate; a hydrogen tartrate | - |
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