WIKTIONARY

black hole

Noun

∙ 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 collapsing massive star.
∙ A void into which things disappear and/or from which nothing emerges. figuratively
- ∙ A sphere of influence into which or from which communication or similar activity is precluded.
- ∙ An entity which consumes time or resources without demonstrable utility.
∙ A dungeon or dark cell in a prison; a military lock-up or guardroom.

BABYLON ENGLISH
black hole n.
theoretical space object which has an extremely strong gravitational force; dungeon

HENGLISH - ADVANCED VERSION
black hole
black hole
\black" hole`\ (&?;). a dungeon or dark cell in a prison; a military lock-up or guardroom; -- now commonly with allusion to the cell (the black hole) in a fort at calcutta, into which 146 english prisoners were thrust by the nabob suraja dowla on the night of june 20, 17656, and in which 123 of the prisoners died before morning from lack of air. a discipline of unlimited autocracy, upheld by rods, and ferules, and the black hole. spencer.

WORDNET 2.0
black hole
Noun
1. a region of space resulting from the collapse of a star; extremely high gravitational field
(hypernym) region, part

ENGLISH WIKIPEDIA - THE FREE ENCYCLOPEDIA
Black hole
A black hole is a geometrically defined region of spacetime exhibiting such strong gravitational effects that nothing—including particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon. Although crossing the event horizon has enormous effect on the fate of the object crossing it, it appears to have no locally detectable features. In many ways a black hole acts like an ideal black body, as it reflects no light. Moreover, quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe.
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