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Definition of heater
heater
/ˈhiːtər/
heat · er
Plural:heaters
heater Lexical Profile
CEFR
A2
Grade
3
Tier
1
Usage
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heater Game Scores & Validity
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Wordle Guess
• noun
1
A device or apparatus that generates and radiates heat, used to raise the temperature of an enclosed space or a fluid.
Example
"During the bitter winter nights, they relied on a small portable heater to keep the bedroom warm."
2
American A high-speed pitch in baseball, typically thrown with maximum velocity; a fastball.
Example
"The rookie pitcher struck out the veteran batter with a 98-mph heater right down the middle of the plate."
3
American A slang term for a handgun or firearm.
Example
"In the classic noir film, the detective checked his coat pocket to make sure he was carrying his heater before stepping into the alley."
Synonyms
View all synonyms for heater Antonyms
View all antonyms for heater• Rhymes for heater
Word Origin & Etymology
Late Middle English, derived from the verb 'heat' combined with the agent suffix '-er' to describe an apparatus that generates warmth.
Cite this Entry
Wordmom. (2026). Definition of Heater. In Wordmom Dictionary. Retrieved Oct 14, 2026, from https://wordmom.com/dictionary/heater