Dictionary:

dioecious

  (dī-ē'shəs)

1. Having the male and female reproductive organs borne on separate individuals of the same species.
2. Characterized by species in which the male and female reproductive organs occur on different individuals; sexually distinct.

[From New Latin Dioecia, former class name : DI–¹ + Greek oikiā, a dwelling.]

Of or relating to organisms, especially plants, having the male and female reproductive organs borne on separate individuals of the same species; sexually distinct.

Sexually distinct; denoting species in which male and female genitals do not occur in the same individual. In botany, having staminate and pistillate flowers on separate plants.

Having male and female flowers on separate plants. Most hollies, junipers, and yews are dioecious. See also monoecious.

The adjective has one meaning:

Meaning #1: having male and female reproductive organs in separate plants or animals
  Synonym: dioecian
  Antonym: monoecious (meaning #1)