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See more synonyms for heater on Thesaurus.com
  1. any of various apparatus for heating, especially for heating water or the air in a room.
  2. Electronics. the element of a vacuum tube that carries the current for heating a cathode.
  3. Slang. a pistol, revolver, or other firearm.
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Origin of heater

First recorded in 1490–1500; heat + -er1
Related formsre·heat·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for heater


  1. any device for supplying heat, such as a hot-air blower, radiator, convector, etc
  2. US slang a pistol
  3. electronics a conductor carrying a current that indirectly heats the cathode in some types of valve
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for heater


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

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Online Etymology Dictionary, © 2010 Douglas Harper