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Meaning of heterothallic

het•er•o•thal•lic

Pronunciation: (het"ur-u-thal'ik), [key]
— adj. Mycol.
  1. having mycelia of two unlike types, both of which must participate in the sexual process. Cf. homothallic (def. 1).
  2. dioecious.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.