Meaning of HEATER in English

HEATER

heat ‧ er S3 /ˈhiːtə $ -ər/ BrE AmE noun [countable]

[ Word Family: noun : ↑ heat , ↑ heater , ↑ heating ; verb : ↑ heat , ↑ overheat ; adverb : ↑ heatedly ; adjective : ↑ heated ≠ UNHEATED ]

a machine for making air or water hotter:

Did you turn the heater off?

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.