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."
codominant
codon
cod-piece
codswallop
coe
co-ed
co-education
co-educational
coefficient
coelacanth
coeliac
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