A sudden, violent event. / (geology) A sudden and violent change in the earth's crust. / A great flood.

In a cataclysmic way.

Synonym of cataclysmic

Of or pertaining to a cataclysm; causing great destruction or upheaval; catastrophic.

plural of cataclysm

As destructive as a cataclysm.

(astronomy) A period of time, approximately 4 billion years ago, during which a large number of impact craters formed on Earth's Moon.

plural of cataclysmatist

One who believes that the most important geological phenomena were produced by cataclysms.

plural of cataclysmist