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Definition of: heterothallism
(het′ər·ə·thal′iz·əm) noun Bot.
A form of sexual differentiation in certain fungi, as the bread mold (Rhizopus nigricans), characterized by the possession of two types of mycelia whose hyphae conjugate to produce zygotes. [<HETERO- + Gk. thallos sprout]
—het′er·o·thal′lic adjective
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