Etymology
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poppet (n.)

"small human figure used in witchcraft and sorcery," c. 1300, popet, early form of puppet (n.). Meaning "small or dainty person" is recorded from late 14c.; later a term of endearment (18c.) but also in other cases one of contempt.

updated on August 30, 2020

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Definitions of poppet from WordNet

poppet (n.)
a mushroom-shaped valve that rises perpendicularly from its seat; commonly used in internal-combustion engines;
Synonyms: poppet valve
From wordnet.princeton.edu, not affiliated with etymonline.