[ 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.

Origin of heater

First recorded in 1490–1500; heat + -er1

Related forms

re·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