/ Dictionary / Index C collapsar: Meaning and Definition of Find definitions for: col•lap•sar Pronunciation: (ku-lap'sär), [key] — n. Astron. (formerly) a gravitationally collapsed star. Cf. black hole. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. collagen disease collapse Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language