A homosexual woman, one who is mostly or exclusively sexually or romantically attracted to other women.
A homosexual female animal.
(of a woman) Homosexual, gay; preferring mostly or exclusively women as romantic or sexual partners.
She is lesbian.
(of a romantic or sexual act or relationship) Between two or more women; homosexual, gay.
a lesbian relationship / marriage / kiss
(especially of an institution or group) Intended for lesbians.
We're going to a lesbian bar tonight.