Illinoian

[ il-uh-noi-uhn ]
/ ˌɪl əˈnɔɪ ən /

noun

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

adjective

Geology. of or relating to the Illinoian stage.

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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. 2020

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