co-ed

Short definition from Wiktionary

Adjective

1. 1
   Of an educational institution, teaching both males and females.
2. 2
   Mixing males and females; unisex; mixed-gender.

Noun

1. 1
   A young woman who attends college.
2. 2
   A (generally young) woman, especially on the campus of a college or other educational institute.
3. 3
   A student of either sex at a co-educational institution.