DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Spay \Spay\, v. t. [imp. & p. p. Spayed; p. pr. & vb. n.
      Spaying.] [Cf. Armor. spac'hein, spaza to geld, W. dyspaddu
      to geld, L. spado a eunuch, Gr. ?.]
      To remove or extirpate the ovaries of, as a sow or a bitch;
      to castrate (a female animal).
      [1913 Webster]