CATACLASM
Cat"a*clasm, n. [Gr. ; down + to break.]
Defn: A breaking asunder; disruption.
CATACLYSM
Cat"a*clysm, n. Etym: [L. cataclysmos, Gr. cataclysme.]
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.
CATACLYSMAL; CATACLYSMIC
Cat`a*clys"mal, Cat"a*clys"mic, a.
Defn: Of or pertaining to a cataclysm.
CATACLYSMIST
Cat`a*clys"mist, n.
Defn: One who believes that the most important geological phenomena have been produced by cataclysms.