[ hee-ter ]
/ ˈhi tər /


any of various apparatus for heating, especially for heating water or the air in a room.
Electronics. the element of a vacuum tube that carries the current for heating a cathode.
Slang. a pistol, revolver, or other firearm.

Nearby words

  1. heat-seal,
  2. heat-seeking,
  3. heat-treat,
  4. heated,
  5. heatedly,
  6. heath,
  7. heath cock,
  8. heath family,
  9. heath grass,
  10. heath hen

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. 2019

Examples from the Web for heater

British Dictionary definitions for heater


/ (ˈhiːtə) /


any device for supplying heat, such as a hot-air blower, radiator, convector, etc
US slang a pistol
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

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.

Online Etymology Dictionary, © 2010 Douglas Harper