/ Dictionary / Index L lichenification: Meaning and Definition of Find definitions for: li•chen•i•fi•ca•tion Pronunciation: (lī-ken"u-fi-kā'shun), [key] — n. Med. a leathery hardening of the skin, usually caused by chronic irritation. a patch of skin so hardened. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lichenic acid lichenin Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language