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
The sediments are alluvial, diluvial, or lacustrine.
The sediments are composed of alluvial, diluvial, and marine sediments.
Older sedimentary rocks are either alluvial and diluvial facies whereas the younger sedimentary rocks are lacustrine.
Diluvial and alluvial sediments are unsuitable for dumps.
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