pertaining to or caused by a flood or deluge.
Geology Now Rare. pertaining to or consisting of diluvium.
Also, diluvian.

1650–60; < Late Latin dīluviālis, equivalent to dīluvi(um) flood (see deluge) + -ālis -al1

prediluvial, adjective
undiluvial, adjective
undiluvian, adjective
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World English Dictionary
diluvial or diluvian (daɪˈluːvɪəl, dɪ-)
1.  of or connected with a deluge, esp with the great Flood described in Genesis
2.  of or relating to diluvium
[C17: from Late Latin dīluviālis; see diluvium]
diluvian or diluvian
[C17: from Late Latin dīluviālis; see diluvium]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
diluvial   (dĭ-l'vē-əl)  Pronunciation Key 
Relating to or produced by a flood.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Remember the ante-diluvian world and the cities of the plain.
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