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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.
blacking a substance that is applied to an object to make it black.
blackjack a short club with a leather cover, heavy head, and flexible handle, used as a weapon. [6 definitions]
black light ultraviolet or infrared radiation that is invisible but indirectly detectable, as by fluorescence.
blacklist a list of persons or groups that are under suspicion, censure, or investigation, as by government, employers, or the like. [2 definitions]
black lung a lung disease, esp. of miners, that is caused by long-term exposure to coal dust.
blackly with malicious or angry looks or intentions. [2 definitions]
black magic magic accomplished with evil intent or by satanic means; sorcery; witchcraft.
blackmail payment forced by threats to reveal damaging information; extortion. [3 definitions]
black margate a grunt of the tropical western Atlantic.
black mark something unfavorable or detrimental in one's record.
black market the illegal purchase or sale of goods in violation of restrictions such as price controls or rationing, customs laws, or the like. [2 definitions]