having male and female flowers borne on separate individuals of the same species (contrast with monoecious).

Merriam-Webster Online Dictionary
dioecious (adjective)
1.
having male reproductive organs in one individual and female in another
2.
having staminate and pistillate flowers borne on different individuals
dioecious (Wikipedia)

Dioecy (Greek: διοικία "two households"; adjective form: dioecious) is a characteristic of a species, meaning that it has distinct male and female individual organisms.Dioecious reproduction is biparental reproduction. Dioecy is one method that excludes self-fertilization and promotes allogamy (outcrossing), and thus tends to reduce the expression of recessive deleterious mutations present in a population.Flowering plants have several other methods of excluding self-fertilization, called self-incompatibility.

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