heater

heat-er · noun

imported

Definitions

noun

  1. 1.

    A device or apparatus for heating a room, water, or other substances.

  2. 2.

    (informal, baseball) A fastball pitch.

  3. 3.

    (slang) A gun or firearm.

Forms

plural: heaters

Phrases & expressions

  • •
    space heater — a portable device for heating a small area
  • •
    water heater — a device for heating water for domestic use

Related words

Antonyms: air conditioner, cooler
See also: furnace, heat, heating, radiator
Synonyms: furnace, radiator, warmer

Etymology

From Old English haetan ("to heat") with the agentive suffix -er, meaning "something that heats."