Breadcrumb Home > Dictionary > Index H Haller: Meaning and Definition of Find definitions for: Hal•ler Pronunciation: (Ger. hä'lur), [key] 1708–77, Swiss physiologist, botanist, and writer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hallelujah Halley ✖ Related Content Daily Word Quiz: restive Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language