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diluvial (adj.)

"pertaining to a flood" (especially The Flood of Genesis), 1650s, from Late Latin diluvialis, from Latin diluvium "flood, inundation," from diluere "wash away," from dis- "away" (see dis-) + -luere, combining form of lavere "to wash" (from PIE root *leue- "to wash"). Related: Diluvian.

Origin and meaning of diluvial

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