/ Dictionary / Index L lethargic encephalitis: Meaning and Definition of Find definitions for: lethar'gic encephali'tis Pronunciation: [key] — Pathol. Pathol. See(def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lethargic lethargize 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