/ Dictionary / Index H horseradish tree: Meaning and Definition of Find definitions for: horse'radish tree" Pronunciation: [key] a tropical tree, Moringa pterygosperma, having fragrant white flowers and seeds yielding a commercially useful oil. Cf. ben. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. horseradish peroxidase horse rake Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language