collapsar

[kuh-lap-sahr]

col·lap·sar

[kuh-lap-sahr]
noun Astronomy.
(formerly) a gravitationally collapsed star.
Compare black hole.


Origin:
1970–75; collapse + -ar, extracted from pulsar, quasar, etc.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collapsar is always a great word to know.
So is event horizon. Does it mean:
any of the nine large heavenly bodies revolving about the sun and shining by reflected light: a similar body revolving about a star other than the sun
the boundary around a black hole on and within which no matter or radiation can escape
Collins
World English Dictionary
collapsar (kɒˈlæpsɑː)
 
n
astronomy a collapsed star, either a white dwarf, neutron star, or black hole

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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