/ Dictionary / Index H hyeto-: Meaning and Definition of Find definitions for: hyeto- Pronunciation: [key] a combining form meaning “rain,” used in the formation of compound words: hyetology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hyetal hyetograph Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language