Dioecia
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Di`oe´ci`a
(dî`ē´shĭ`å) n. pl. 1. (Bot.) A Linnæan class of plants having the stamens and pistils on different plants.
2. (Zool.) A subclass of gastropod mollusks in which the sexes are separate. It includes most of the large marine species, like the conchs, cones, and cowries.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.