Cataclysm
Pronunciation : Cat"a*clysm
Part of Speech : n.
Etymology : [L. cataclysmos, Gr. cataclysme.]
Definition : 1. An extensive overflow or sweeping flood of water; a deluge.
2. (Geol.)
Defn: Any violent catastrophe, involving sudden and extensive changes of the earth's surface.
Source : Webster's Unabridged Dictionary, 1913