unisexual

Short definition from Wiktionary

Adjective

1. 1
   Of an organism, having characteristics of a single sex (as opposed to hermaphrodites).
2. 2
   Of a species, having only a single (potentially hermaphroditic) sex (as opposed to bisexual).
3. 3
   Unisex; suitable for any sex or gender.

Noun

1. 1
   An organism which is unisexual.