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