/ Dictionary / Index I illite: Meaning and Definition of Find definitions for: il•lite Pronunciation: (il'īt), [key] — n. any of a group of clay minerals, hydrous potassium aluminosilicates, characterized by a three-layer micalike structure and a gray, light green, or yellowish-brown color. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. illiquid illiteracy Related Content Daily Word Quiz: longevity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language