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The Collaborative International Dictionary
Clysmian

Clysmian \Clys"mi*an\, a. [Gr. ? a place washed by the waves, fr. ?. See Clyster.] Connected with, or related to, the deluge, or to a cataclysm; as, clysmian changes.
--Smart.

Wiktionary
clysmian

a. Connected with, or related to, the deluge, or to a cataclysm.