black hole

SEE SYNONYMS FOR black hole ON THESAURUS.COM

noun Astronomy.

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.

Words nearby black hole

black-hearted, black heat, Blackheath, black heroin, Black Hills, black hole, Black Hole of Calcutta, black horehound, black house, black huckleberry, Black, Hugo

Definition for black hole (2 of 2)

Black Hole

noun

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.

(lowercase) any usually wretched place of imprisonment or confinement.

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for black hole

Mr. Hawes, was he sent to the black-hole for doing what the chaplain had set him to do by way of a moral lesson?
It Is Never Too Late to Mend|Charles Reade
The most surprising matter in the whole business is, that Sir Hudson did not instantly send the blusterer to the black-hole.
Blackwood's Edinburgh Magazine, Volume 62, No. 382, October 1847|Various
On the tenth day Robinson tried to exchange a word with a prisoner in chapel, and for this he was taken to the black-hole.
The World's Greatest Books, Vol VII|Various
A man escaped from the black-hole, who had been condemned to remain in it during the war, for attempting to blow up a ship.
A Journal of a Young Man of Massachusetts, 2nd ed.|Benjamin Waterhouse

I have a mind to consign thee to my black-hole, and to have thee shot in the morning.'
The Virginians|William Makepeace Thackeray

British Dictionary definitions for black hole

black hole

/ astronomy /

noun

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

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with black hole

black hole

A wretched prison cell or other place of confinement. For example, The punishment is solitary confinement, known as the black hole. This term acquired its meaning in 1756 with the event known as the Black Hole of Calcutta. On the night of June 20, the ruler of Bengal confined 146 Europeans in a prison space of only 14 by 18 feet. By morning all but 23 of them had suffocated to death. Although historians since have questioned the truth of the story, it survives in this usage.

A great void or abyss. For example, Running a single small newspaper ad to launch a major campaign is useless; it amounts to throwing our money into a black hole. This usage alludes to a region, so named by astronomers, whose gravitational field is so intense that no electromagnetic radiation can escape from it. [Late 1970s]

Cultural definitions for black hole

black hole

In astronomy, an object so massive that nothing, not even light, can escape its gravitation. Black holes were given their name because they absorb all the light that falls on them. The existence of black holes was first predicted by the general theory of relativity. Supermassive black holes have been found in the centers of many galaxies. Stellar black holes are thought to arise from the death of very massive stars. Astronomers expect to find many stellar black holes in the Milky Way.

notes for black hole

Figuratively, the term black hole is used to refer to a total disappearance: “They never saw the man again — he might as well have fallen into a black hole.”

Scientific definitions for black hole

black hole

An extremely dense celestial object whose gravitational field is so strong that not even light can escape from its vicinity. Black holes are believed to form in the aftermath of a supernova with the collapse of the star's core. See also event horizon. See more at star.

A Closer Look

When a very massive star ends its life in a supernova explosion, the remaining matter collapses in upon itself. If there is enough mass in this collapsed star, it becomes a black hole. A black hole is so dense that its gravitational forces are strong enough to prevent anything that comes close enough to the region known as the event horizon from escaping. Even light cannot escape, since the escape velocity (the velocity needed for an object to escape some larger object's gravitational field) necessary to escape a black hole is greater than the speed of light. Black holes are extremely dense: for the Sun, which has a diameter of about 1,390,000 kilometers (862,000 miles), to be as dense as a black hole, its entire mass would have to be squeezed down to a ball fewer than 3 kilometers (5 miles) across. Some theorists postulate that the material in a black hole may be compressed to a single point of infinite density called a singularity. Because astronomers cannot directly observe a black hole, they infer its existence from the effects of its gravitational pull. For example, when a black hole results from the collapse of one star in a binary star system, it attracts material from the remaining star. This material forms an accretion disk, which compresses and heats up until it emits detectable x-rays. Black holes are thought to reside in the centers of many galaxies, including our own Milky Way.

单词	black hole
释义	black hole SEE SYNONYMS FOR black hole ON THESAURUS.COM noun Astronomy. 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. Words nearby black hole black-hearted, black heat, Blackheath, black heroin, Black Hills, black hole, Black Hole of Calcutta, black horehound, black house, black huckleberry, Black, Hugo Definition for black hole (2 of 2) Black Hole noun 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. (lowercase) any usually wretched place of imprisonment or confinement. Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for black hole Mr. Hawes, was he sent to the black-hole for doing what the chaplain had set him to do by way of a moral lesson? It Is Never Too Late to Mend\|Charles Reade The most surprising matter in the whole business is, that Sir Hudson did not instantly send the blusterer to the black-hole. Blackwood's Edinburgh Magazine, Volume 62, No. 382, October 1847\|Various On the tenth day Robinson tried to exchange a word with a prisoner in chapel, and for this he was taken to the black-hole. The World's Greatest Books, Vol VII\|Various A man escaped from the black-hole, who had been condemned to remain in it during the war, for attempting to blow up a ship. A Journal of a Young Man of Massachusetts, 2nd ed.\|Benjamin Waterhouse I have a mind to consign thee to my black-hole, and to have thee shot in the morning.' The Virginians\|William Makepeace Thackeray British Dictionary definitions for black hole black hole / astronomy / noun 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 Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Idioms and Phrases with black hole black hole 1 A wretched prison cell or other place of confinement. For example, The punishment is solitary confinement, known as the black hole. This term acquired its meaning in 1756 with the event known as the Black Hole of Calcutta. On the night of June 20, the ruler of Bengal confined 146 Europeans in a prison space of only 14 by 18 feet. By morning all but 23 of them had suffocated to death. Although historians since have questioned the truth of the story, it survives in this usage. 2 A great void or abyss. For example, Running a single small newspaper ad to launch a major campaign is useless; it amounts to throwing our money into a black hole. This usage alludes to a region, so named by astronomers, whose gravitational field is so intense that no electromagnetic radiation can escape from it. [Late 1970s] The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. Words related to black hole void, supernova Cultural definitions for black hole black hole In astronomy, an object so massive that nothing, not even light, can escape its gravitation. Black holes were given their name because they absorb all the light that falls on them. The existence of black holes was first predicted by the general theory of relativity. Supermassive black holes have been found in the centers of many galaxies. Stellar black holes are thought to arise from the death of very massive stars. Astronomers expect to find many stellar black holes in the Milky Way. notes for black hole Figuratively, the term black hole is used to refer to a total disappearance: “They never saw the man again — he might as well have fallen into a black hole.” The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Scientific definitions for black hole black hole An extremely dense celestial object whose gravitational field is so strong that not even light can escape from its vicinity. Black holes are believed to form in the aftermath of a supernova with the collapse of the star's core. See also event horizon. See more at star. A Closer Look When a very massive star ends its life in a supernova explosion, the remaining matter collapses in upon itself. If there is enough mass in this collapsed star, it becomes a black hole. A black hole is so dense that its gravitational forces are strong enough to prevent anything that comes close enough to the region known as the event horizon from escaping. Even light cannot escape, since the escape velocity (the velocity needed for an object to escape some larger object's gravitational field) necessary to escape a black hole is greater than the speed of light. Black holes are extremely dense: for the Sun, which has a diameter of about 1,390,000 kilometers (862,000 miles), to be as dense as a black hole, its entire mass would have to be squeezed down to a ball fewer than 3 kilometers (5 miles) across. Some theorists postulate that the material in a black hole may be compressed to a single point of infinite density called a singularity. Because astronomers cannot directly observe a black hole, they infer its existence from the effects of its gravitational pull. For example, when a black hole results from the collapse of one star in a binary star system, it attracts material from the remaining star. This material forms an accretion disk, which compresses and heats up until it emits detectable x-rays. Black holes are thought to reside in the centers of many galaxies, including our own Milky Way. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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black hole

noun Astronomy.

Words nearby black hole

Definition for black hole (2 of 2)

noun

Example sentences from the Web for black hole

British Dictionary definitions for black hole

noun

Idioms and Phrases with black hole

Words related to black hole

Cultural definitions for black hole

notes for black hole

Scientific definitions for black hole

A Closer Look