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di·lu·vi·al(dĭ-lo͞o′vē-əl) also di·lu·vi·an (-ən)
Of, relating to, or produced by a flood.
[Late Latin dīluviālis, from Latin dīluvium, flood, from dīluere, to wash away; see dilute.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.