Webster’s Revised Unabridged Dictionary · 1913
Spay
Spay (spā), 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. σπάδων.] To remove or extirpate the ovaries of, as a sow or a bitch; to castrate (a female animal).
Spay, n. [Cf. Spade a spay, Spay, v. t.] (Zoöl.) The male of the red deer in his third year; a spade.