/ Dictionary / Index E ethephon: Meaning and Definition of Find definitions for: eth•e•phon Pronunciation: (eth'u-fon"), [key] — n. Chem. a solid compound, CHClOP, used as a growth regulator to accelerate the ripening of tomatoes, citrus fruit, apples, and other crops. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ethene ether Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language