/ Dictionary / Index L lewisite: Meaning and Definition of Find definitions for: lew•is•ite Pronunciation: (l'u-sīt"), [key] — n. a pale yellow, odorless compound, CHAsCl, used as a blister gas in World War I. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Lewisham Lewis Mountains Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language