[ hee-ter ]
See 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.

  1. Slang. a pistol, revolver, or other firearm.

Origin of heater

First recorded in 1490–1500; heat + -er1

Other words from heater

  • re·heat·er, noun

Words Nearby heater

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use heater in a sentence

British Dictionary definitions for heater


/ (ˈhiːtə) /

  1. any device for supplying heat, such as a hot-air blower, radiator, convector, etc

  2. US slang a pistol

  1. electronics a conductor carrying a current that indirectly heats the cathode in some types of valve

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