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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]
black-market to buy or sell on the black market.
black marketeer one who buys or sells in the black market.
Black Muslim a member of the Nation of Islam.
black nationalism (often caps.) a U.S. movement that advocates the establishment of a separate black nation.
blackout the extinguishing or hiding of all the lights of a city or region, as in a power failure or air raid. [4 definitions]