/ Dictionary / Index L lithium aluminum hydride: Meaning and Definition of Find definitions for: lith'ium alu'minum hy'dride Pronunciation: [key] — Chem. Chem. a white powder, LiAlH, used chiefly as a chemical reducing agent, esp. in pharmaceutical and perfume manufacturing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lithium lithium carbonate Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language