Etymology
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co-ed (n.)

also coed, 1886, American English, (first in Louisa Mae Alcott's "Jo's Boys"); short for "co-educational system;" 1889 as an adjective, short for co-educational; 1887 as a noun meaning "girl or woman student at a co-educational institution."

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Definitions of co-ed
1
co-ed (n.)
a female student at a coeducational college or university;
Synonyms: college girl
2
co-ed (adj.)
attended by members of both sexes;
Synonyms: coeducational
From wordnet.princeton.edu