Illinoian

[ il-uh-noi-uhn ]

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

adjective
  1. Geology. of or relating to the Illinoian stage.

Origin of Illinoian

1
An Americanism dating back to 1825–35; Illinoi(s) + -an

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024