Webster's Revised Unabridged Dictionary · 1913

Spay

Spay , transitive verb

[Compare Armor. spac'hein, spaza to geld, Welsh dyspaddu to geld, Latin spado a eunuch, Greek {not transcribed}.]

To remove or extirpate the ovaries of, as a sow or a bitch; to castrate (a female animal).

Spay , noun

[Compare Spade a spay, Spay, transitive verb]

(Zoology) The male of the red deer in his third year; a spade.