GNU Collaborative International Dictionary of English

Found one definition

1.       
   Cox (k?ks), n. [OE.  cokes. Cf. Coax.] A coxcomb; a simpleton; a gull. [Obs.]
   
   [1913 Webster]
   
   Go; you're a brainless cox, a toy, a fop. Beau. & Fl.
   
   [1913 Webster]