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Illinoian

[il-uh-noi-uh n] /ˌɪl əˈnɔɪ ən/
noun
1.
Geology. the third stage of the glaciation of North America during the Pleistocene.
adjective
3.
Geology. of or relating to the Illinoian stage.
Origin of Illinoian
1825-1835
1825-35, Americanism; Illinoi(s) + -an
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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