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WordNet-OnlineFree dictionary and thesaurus of English. Definitions, synonyms, antonyms and more...
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Noun heater has 2 senses
heater, warmer - device that heats water or supplies warmth to a room--1 is a kind of device
 --1 has particulars:
fastball, heater, smoke, hummer, bullet - (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke"--2 is a kind of pitch, delivery
 --2 has particulars: slider
 
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