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Schwarzschild radius

[German shvahrts-shilt; English shwawrts-chahyld, -shild] /German ˈʃvɑrtsˌʃɪlt; English ˈʃwɔrtsˌtʃaɪld, -ʃɪld/
noun, Astronomy.
the radius at which a gravitationally collapsing celestial body becomes a black hole.
Origin of Schwarzschild radius
1955-60; named after Karl Schwarzchild (1873-1916), German astronomer Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for Schwarzschild radius

Schwarzschild radius

/ˈʃwɔːtsˌʃɪld; German ˈʃvartsʃɪlt/
(astronomy) the radius of a sphere (Schwarzschild sphere) surrounding a non-rotating uncharged black hole, from within which no information can escape because of gravitational forces
Word Origin
C20: named after Karl Schwarzschild (1873–1916), US astrophysicist
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
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Schwarzschild radius in Science
Schwarzschild radius
  (shwôrts'chīld', shvärts'shĭld)   
A radius defined for a body of a given mass and proportional to that mass, such that if the body is smaller than that radius, the force of gravity is strong enough to prevent matter and energy to escape from within that radius. The Earth is much larger than its Schwarzschild radius, which is approximately 7 mm (0.28 inches).Black holes are examples of objects smaller than their Schwarzschild radius, which defines the radius of their event horizon. The Schwarzschild radius is a consequence of Einstein's General Relativity theory. It is named after the German astronomer Karl Schwarzschild (1873-1916).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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