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heater (n.)

c. 1500, of persons; 1660s of devices; agent noun from heat (v.). Baseball slang meaning "fastball" is attested by 1985.

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Definitions of heater from WordNet

heater (n.)
device that heats water or supplies warmth to a room;
Synonyms: warmer
heater (n.)
(baseball) a pitch thrown with maximum velocity;
Synonyms: fastball / smoke / hummer / bullet
From wordnet.princeton.edu