impact crater

impact crater

noun Astronomy, Geology.
crater (def. 2).

Origin:
1890–95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Impact crater is always a great word to know.
So is event horizon. Does it mean:
a theory that deduces a cataclysmic birth of the universe from the observed expansion of the universe, cosmic background radiation, abundance of the elements, and the laws of physics
the boundary around a black hole on and within which no matter or radiation can escape
Dictionary.com's 21st Century Lexicon
Main Entry:  impact crater
Part of Speech:  n
Definition:  a depression in the ground believed to have been caused by a meteorite
Example:  Does the earth have impact craters?
Dictionary.com's 21st Century Lexicon
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