Definition of heater noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈhiːtə(r)//
; NAmE NAmE//ˈhiːtər//
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a machine used for making air or water warmer a gas heater a water heater see also immersion heater, storage heaterExtra examples Even with the heater full on, the room felt cold. Do you want to put the heater on? It is thought that the fire was caused by a gas leak from a water heater. There is a timer fitted to the immersion heater. a fan heater a space heater
See the Oxford Advanced American Dictionary entry: heater