Dictionary
black' hole'
Astron.a 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'
1. Also 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.
2. (
l.c.) any usually wretched place of imprisonment or confinement.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.