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 (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.
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Adj.1.diluvian - of or connected with a deluge
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References in classic literature ?
William Gilpin, who is so admirable in all that relates to landscapes, and usually so correct, standing at the head of Loch Fyne, in Scotland, which he describes as "a bay of salt water, sixty or seventy fathoms deep, four miles in breadth," and about fifty miles long, surrounded by mountains, observes, "If we could have seen it immediately after the diluvian crash, or whatever convulsion of nature occasioned it, before the waters gushed in, what a horrid chasm must it have appeared!
By century's end, many parts of the world may have to cope with up to six climate catastrophes at once, ranging from heat waves and wildfires to diluvian rains and deadly storm surges, researchers warned Monday.
Zeus (Jupiter) himself was known to wreak aquatic havoc on a diluvian scale, from time to time, as we learn from Apollodorus (Bibliotheca 1:7.2) and Ovid (Metamorphoses 1:244-252, 253-312, 313-415).