Pronunciation: (di-zas'tur, -zä'stur), [key]
1. a calamitous event, esp. one occurring suddenly and causing great loss of life, damage, or hardship, as a flood, airplane crash, or business failure.
2. Obs.an unfavorable aspect of a star or planet.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.