GNU Collaborative International Dictionary of English

Found one definition

      
Co- (kṓ-). A form of the prefix com-, signifying with, together, in conjunction, joint. It is used before vowels and some consonants. See Com-.

[1913 Webster]

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Abay, Ay, Ba, Baa, Bab, Baby, Bac, Bad, Bag, Bah, Bai, Bam, Ban, Bar, Bat, Bay, Baya, Bays, Bey, Blay, Boy, Bray, Buy, By, Cay, Day, Fay, Gay, Hay, Jay, Lay, May, Nay, Pay, Ray, Say, Way