- co-ed (n.)
[co-ed 词源字典]
- 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 coeducational; 1893 as a noun meaning "girl or woman student at a co-educational institution."[co-ed etymology, co-ed origin, 英语词源]