Schwarzschild radius

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Schwarz·schild radius

 (shwôrts′chīld′, shvärts′shĭld)
The radius of a collapsing celestial object at which gravitational forces require an escape velocity that exceeds the velocity of light, resulting in a black hole.

[After Karl Schwarzschild (1873-1916), German astronomer.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Schwarzschild radius

(ˈʃwɔːtsˌʃɪld; German ˈʃvartsʃɪlt)
(Astronomy) 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
[C20: named after Karl Schwarzschild (1873–1916), US astrophysicist]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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