| afterbirth | (noun) the placenta and fetal membranes that are expelled from the uterus after the baby is born | - |
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| antbird | (noun) any of various dull-colored South American birds that feeding on ants some following army ant swarms | Synonyms: ant bird |
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| babiroussa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babirusa, babirussa, Babyrousa Babyrussa |
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| babirusa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babiroussa, babirussa, Babyrousa Babyrussa |
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| babirussa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babiroussa, babirusa, Babyrousa Babyrussa |
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| bellbird | (noun) any of several tropical American birds of the genus Procnias having a bell-like call | - |
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| birch | (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 |
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| (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 | - |
| birchbark | (noun) a canoe made with the bark of a birch tree | Synonyms: birch bark, birchbark canoe |
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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 |
| 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 | - |
| birdlime | (noun) a sticky adhesive that is smeared on small branches to capture small birds | Synonyms: lime |
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| birdnest | (noun) nest where birds lay their eggs and hatch their young | Synonyms: bird's nest, bird nest |
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| 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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| birefringence | (noun) splitting a ray into two parallel rays polarized perpendicularly | Synonyms: 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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| 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 |
| 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) | - |
| 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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| blackbird | (noun) any bird of the family Icteridae whose male is black or predominantly black | Synonyms: New World blackbird |
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| (noun) common black European thrush | Synonyms: European blackbird, merl, merle, ousel, ouzel, Turdus merula |
| bluebird | (noun) blue North American songbird | - |
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| (noun) fruit-eating mostly brilliant blue songbird of the East Indies | Synonyms: fairy bluebird |
| bowerbird | (noun) any of various birds of the Australian region whose males build ornamented structures resembling bowers in order to attract females | Synonyms: catbird |
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| butcherbird | (noun) shrikes that impale their prey on thorns | - |
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| (noun) large carnivorous Australian bird with the shrike-like habit of impaling prey on thorns | - |
| catbird | (noun) North American songbird whose call resembles a cat's mewing | Synonyms: Dumetella carolinensis, gray catbird, grey catbird |
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| (noun) any of various birds of the Australian region whose males build ornamented structures resembling bowers in order to attract females | Synonyms: bowerbird |
| cedarbird | (noun) widely distributed over temperate North America | Synonyms: Bombycilla cedrorun, cedar waxwing |
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| childbirth | (noun) the parturition process in human beings; having a baby; the process of giving birth to a child | Synonyms: accouchement, childbearing, vaginal birth |
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| cowbird | (noun) North American blackbird that follows cattle and lays eggs in other birds' nests | - |
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| dickeybird | (noun) small bird; adults talking to children sometimes use these words to refer to small birds | Synonyms: dickey-bird, dicky-bird, dickybird |
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| dickybird | (noun) small bird; adults talking to children sometimes use these words to refer to small birds | Synonyms: dickey-bird, dickeybird, dicky-bird |
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| firebird | (noun) eastern subspecies of northern oriole | Synonyms: Baltimore bird, Baltimore oriole, hangbird, Icterus galbula galbula |
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| (noun) the male is bright red with black wings and tail | Synonyms: Piranga olivacea, redbird, scarlet tanager |
| (noun) tropical American flycatcher found as far north as southern Texas and Arizona; adult male has bright scarlet and black plumage | Synonyms: Pyrocephalus rubinus mexicanus, vermillion flycatcher |
| gaolbird | (noun) a criminal who has been jailed repeatedly | Synonyms: jail bird, jailbird |
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| hangbird | (noun) eastern subspecies of northern oriole | Synonyms: Baltimore bird, Baltimore oriole, firebird, Icterus galbula galbula |
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| hummingbird | (noun) tiny American bird having brilliant iridescent plumage and long slender bills; wings are specialized for vibrating flight | - |
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| jabiru | (noun) large white stork of warm regions of the world especially America | Synonyms: Jabiru mycteria |
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| (noun) large black-and-white stork of tropical Africa; its red bill has a black band around the middle | Synonyms: Ephippiorhynchus senegalensis, saddlebill |
| (noun) large mostly white Australian stork | Synonyms: black-necked stork, policeman bird, Xenorhyncus asiaticus |
| jailbird | (noun) a criminal who has been jailed repeatedly | Synonyms: gaolbird, jail bird |
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| jaybird | (noun) common jay of eastern North America; bright blue with grey breast | Synonyms: blue jay, Cyanocitta cristata |
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| kingbird | (noun) large American flycatcher | Synonyms: Tyrannus tyrannus |
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| ladybird | (noun) small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests | Synonyms: lady beetle, ladybeetle, ladybird beetle, ladybug |
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| lovebird | (noun) small African parrot noted for showing affection for their mates | - |
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| (noun) small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors | Synonyms: budgereegah, budgerigar, budgerygah, budgie, grass parakeet, Melopsittacus undulatus, shell parakeet |
| lyrebird | (noun) Australian bird that resembles a pheasant; the courting male displays long tail feathers in a lyre shape | - |
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| mockingbird | (noun) long-tailed grey-and-white songbird of the southern United States able to mimic songs of other birds | Synonyms: Mimus polyglotktos, mocker |
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| moorbird | (noun) reddish-brown grouse of upland moors of Great Britain | Synonyms: Lagopus scoticus, moor-bird, moorfowl, moorgame, red grouse |
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| nightbird | (noun) a person who likes to be active late at night | Synonyms: night owl, nighthawk |
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| oilbird | (noun) nocturnal fruit-eating bird of South America that has fatty young yielding an oil that is used instead of butter | Synonyms: guacharo, Steatornis caripensis |
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| ovenbird | (noun) American warbler; builds a dome-shaped nest on the ground | Synonyms: Seiurus aurocapillus |
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| (noun) small brownish South American birds that build oven-shaped clay nests | - |
| puffbird | (noun) brownish tropical American bird having a large head with fluffed out feathers | - |
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| railbird | (noun) a fan of racing who watches races from the outer rail of the track | - |
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| rebirth | (noun) a spiritual enlightenment causing a person to lead a new life | Synonyms: conversion, spiritual rebirth |
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| (noun) the revival of learning and culture | Synonyms: Renaissance, Renascence |
| (noun) a second or new birth | Synonyms: reincarnation, renascence |
| (noun) after death the soul begins a new cycle of existence in another human body | Synonyms: metempsychosis |
| redbird | (noun) crested thick-billed North American finch having bright red plumage in the male | Synonyms: cardinal, cardinal grosbeak, Cardinalis cardinalis, Richmondena Cardinalis |
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| (noun) the male is bright red with black wings and tail | Synonyms: firebird, Piranga olivacea, scarlet tanager |
| reedbird | (noun) migratory American songbird | Synonyms: bobolink, Dolichonyx oryzivorus, ricebird |
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| (noun) small European warbler that breeds among reeds and wedges and winters in Africa | Synonyms: Acrocephalus schoenobaenus, sedge bird, sedge warbler, sedge wren |
| ricebird | (noun) migratory American songbird | Synonyms: bobolink, Dolichonyx oryzivorus, reedbird |
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| (noun) small finch-like Indonesian weaverbird that frequents rice fields | Synonyms: Java finch, Java sparrow, Padda oryzivora |
| riflebird | (noun) velvety black Australian bird of paradise with green and purple iridescence on head and tail | Synonyms: Ptloris paradisea |
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| scrubbird | (noun) small fast-running Australian bird resembling a wren and frequenting brush or scrub | Synonyms: scrub-bird, scrub bird |
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| seabird | (noun) a bird that frequents coastal waters and the open ocean: gulls, pelicans, gannets, cormorants, albatrosses, petrels, etc. | Synonyms: sea bird, seafowl |
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| shoebird | (noun) large stork-like bird of the valley of the White Nile with a broad bill suggesting a wooden shoe | Synonyms: Balaeniceps rex, shoebill |
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| shorebird | (noun) any of numerous wading birds that frequent mostly seashores and estuaries | Synonyms: limicoline bird, shore bird |
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| snakebird | (noun) fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill | Synonyms: anhinga, darter |
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| snowbird | (noun) white Arctic bunting | Synonyms: Plectrophenax nivalis, snow bunting, snowflake |
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| (noun) small North American finch seen chiefly in winter | Synonyms: junco |
| (noun) medium-sized Eurasian thrush seen chiefly in winter | Synonyms: fieldfare, Turdus pilaris |
| songbird | (noun) any bird having a musical call | Synonyms: songster |
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| stillbirth | (noun) a natural loss of the products of conception | Synonyms: miscarriage, spontaneous abortion |
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| stiltbird | (noun) long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons | Synonyms: Himantopus stilt, long-legs, longlegs, stilt, stilt plover |
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| stinkbird | (noun) crested ill-smelling South American bird whose young have claws on the first and second digits of the wings | Synonyms: hoactzin, hoatzin, Opisthocomus hoazin |
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| surfbird | (noun) sandpiper-like shorebird of Pacific coasts of North America and South America | Synonyms: Aphriza virgata |
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| tailorbird | (noun) tropical Asian warbler that stitches leaves together to form and conceal its nest | Synonyms: Orthotomus sutorius |
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| thunderbird | (noun) (mythology) the spirit of thunder and lightning believed by some Native Americans to take the shape of a great bird | - |
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| tropicbird | (noun) mostly white web-footed tropical seabird often found far from land | Synonyms: boatswain bird, tropic bird |
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| waterbird | (noun) freshwater aquatic bird | Synonyms: water bird, waterfowl |
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| weaverbird | (noun) finch-like African and Asian colonial birds noted for their elaborately woven nests | Synonyms: weaver, weaver finch |
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| whirlybird | (noun) an aircraft without wings that obtains its lift from the rotation of overhead blades | Synonyms: chopper, eggbeater, helicopter |
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| yardbird | (noun) a military recruit who is assigned menial tasks | Synonyms: yard bird |
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| (noun) a person serving a sentence in a jail or prison | Synonyms: con, convict, inmate, yard bird |
| yellowbird | (noun) American finch whose male has yellow body plumage in summer | Synonyms: goldfinch, New World goldfinch, Spinus tristis |
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| (noun) yellow-throated American wood warbler | Synonyms: Dendroica petechia, golden warbler, yellow warbler |