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WordReference Random House Learner's Dictionary of American English © 2024ˈblack ˈhole, n. [countable]- Astronomya large object in an area of space that has gravity so strong that no light or other radiation can escape from it:Black holes may have been formed at the beginning of the universe.
WordReference Random House Unabridged Dictionary of American English © 2024black′ hole′, - Astronomya theoretical massive object, formed at the beginning of the universe or by the gravitational collapse of a star exploding as a supernova, whose gravitational field is so intense that no electromagnetic radiation can escape.
Black′ Hole′, - World HistoryAlso called Black′ Hole′ of Cal•cut′ta. a small prison cell in Fort William, Calcutta, in which, in 1756, Indians are said to have imprisoned 146 Europeans, only 23 of whom were alive the following morning.
- World History(l.c.) any usually wretched place of imprisonment or confinement.
Collins Concise English Dictionary © HarperCollins Publishers:: black hole n - an object in space so dense that its escape velocity exceeds the speed of light
- any place regarded as resembling a black hole in that items or information entering it cannot be retrieved
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