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 spathē "broad blade" (see spade (n.1)). Related: Spayed; spaying.

updated on June 15, 2022

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Definitions of spay from WordNet

spay (v.)
remove the ovaries of;
Is your cat spayed?
Synonyms: alter / neuter / castrate
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.