Illinoian

[il-uh-noi-uh n]
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noun

Geology. the third stage of the glaciation of North America during the Pleistocene.

adjective

Geology. of or relating to the Illinoian stage.

Origin of Illinoian

An Americanism dating back to 1825–35; Illinoi(s) + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for illinoian

Historical Examples of illinoian