noun, plural diluvia [dih-loo-vee-uh] , diluviums. Geology Now Rare.
a coarse surficial deposit formerly attributed to a general deluge but now regarded as glacial drift.
Also, diluvion.

1810–20; < Latin dīluvium flood; see deluge

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World English Dictionary
diluvium (daɪˈluːvɪəm, dɪ-)
n , pl -via
geology See drift a former name for glacial drift
[C19: from Latin: flood, from dīluere to wash away; see dilute]

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