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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.
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.
black hole a hypothetical region or body in space, possibly the remnants of a collapsed star, with such a strong gravitational pull that neither light nor matter can escape.