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Webster 1913 Edition

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Adj.

Of or pertaining to a cataclysm.

cataclysmic ‎(not comparable)

Of or pertaining to a cataclysm; causing great destruction or upheaval; catastrophic.
It is believed that a cataclysmic impact caused the extinction of the dinosaurs.
- 2005, Edmund White, My Women
  That’s why to be rejected in love was so cataclysmic: one had been judged and found wanting.

of or pertaining to a cataclysm