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n A gravitationally domineering celestial body with an event horizon from which even light cannot escape; the most dense material in the universe, condensed into a singularity, usually formed by a collapse|collapsing massive star.

n A sphere of influence into which or from which communication or similar activity is precluded.

n An entity which consumes time or resources without demonstrable utility.

n A dungeon or dark cell in a prison; a military lock-up or guardroom.