Etymology
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preheat (v.)

also pre-heat, "to heat in advance of use or further preparation," 1878, from pre- "before" + heat (v.). Related: Preheated; preheating.

updated on October 17, 2020

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Definitions of preheat from WordNet

preheat (v.)
heat beforehand;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.