/ Dictionary / Index H heterothallic: Meaning and Definition of Find definitions for: het•er•o•thal•lic Pronunciation: (het"ur-u-thal'ik), [key] — adj. Mycol. having mycelia of two unlike types, both of which must participate in the sexual process. Cf. homothallic (def. 1). dioecious. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heterotelic heterotopia Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language