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From The Collaborative International Dictionary of English v.0.48:
Unisexual \U`ni*sex"u*al\, a. [Uni- + sexual: cf. F. unisexuel.] (Biol.) Having one sex only, as plants which have the male and female flowers on separate individuals, or animals in which the sexes are in separate individuals; di[oe]cious; -- distinguished from bisexual, or hermaphrodite. See Di[oe]cious. [1913 Webster]