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blackbody in physics, a hypothetical body that theoretically absorbs all radiant energy falling on its surface.
black book a real or imaginary notebook containing names of people, usu. recorded for future censure or punishment.
blackbuck a long-horned antelope native to India that has a brownish black back and a white belly.
blackcap any of several birds with a black crown, such as the chickadee. [2 definitions]
blackcock the male black grouse.
black cohosh an eastern North American perennial herb (Cimicifuga racemosa, or Actaea racemosa) of the buttercup family, the rhizome and roots of which are used as an herbal remedy.
blackdamp a suffocating gas composed of carbon dioxide and nitrogen, found as a residue of fires and explosions of combustible gases in mines; chokedamp.
Black Death a deadly plague, probably bubonic, that was widespread in Europe in the mid-fourteenth century, characterized by dark splotches on the skin.
black duck a dark brown pond duck of northeastern North America. [2 definitions]
blacken to make black; make dark. [3 definitions]
black eye darkening and discoloration of the flesh around the eye, as from a bruise or blow. [2 definitions]
black-eyed pea the seed of the cowpea plant, used as food; cowpea.
black-eyed Susan any of numerous related North American wildflowers with yellow or orange-yellow petals surrounding a dark center.
blackface theatrical make-up used to burlesque a black character, as in a minstrel show, or an actor playing such a character. [2 definitions]
black flag see Jolly Roger.
Blackfoot a member of an Algonquian Indian tribe formerly resident in Montana, Alberta, and Saskatchewan. [2 definitions]
black frost severe cold that blackens living plants without the appearance of frost crystals.
black grouse a large game bird of Europe and Asia, the male of which is black with white markings.
blackguard an unprincipled, dishonest person; scoundrel. [2 definitions]
blackhead a small, black-tipped plug of fatty matter blocking a pore of the skin, esp. on the face. [3 definitions]
black-hearted evil and malicious.