Etymology
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spay (v.)

early 15c., "stab with a sword, kill," also "remove the ovaries of (a hunting dog)," from Anglo-French espeier "cut with a sword," Old French espeer, espaer, from espee "sword" (Modern French épée), from Latin spatha "broad, flat weapon or tool," from Greek spathe "broad blade" (see spade (n.1)). Compare Greek spadon "eunuch." Related: Spayed; spaying.

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Definitions of spay

spay (v.)
remove the ovaries of;
Is your cat spayed?
Synonyms: alter / neuter / castrate
From wordnet.princeton.edu