Metaglossary.com - Definitions for "{term}"

Keywords: upheaval, violent, change

a violent change or upheaval.

library.thinkquest.org

Keywords: earthquake, destructive, nuclear, war, severely

severely destructive; "cataclysmic nuclear war"; "a cataclysmic earthquake"

wordnet.princeton.edu

Keywords: pertaining

Of or pertaining to a cataclysm.