radiator

American  

[rey-dee-ey-ter] / ˈreɪ diˌeɪ tər /

noun

radiators plural

1. a person or thing that radiates.

2. any of various heating devices, as a series or coil of pipes through which steam or hot water passes.

3. a device constructed from thin-walled tubes and metal fins, used for cooling circulating water, as in an automobile engine.

4. Radio. a transmitting antenna.

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radiator British  

/ ˈreɪdɪˌeɪtə /

noun

1. a device for heating a room, building, etc, consisting of a series of pipes through which hot water or steam passes

2. a device for cooling an internal-combustion engine, consisting of thin-walled tubes through which water passes. Heat is transferred from the water through the walls of the tubes to the airstream, which is created either by the motion of the vehicle or by a fan

3. an electric fire

4. electronics the part of an aerial or transmission line that radiates electromagnetic waves

5. an electric space heater

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radiator Scientific  

/ rā′dē-ā′tər /

1. A body that emits radiation. Radiators are commonly designed to transfer heat energy from one place to another, as in an automobile, in which the radiator cools the engine by transferring heat energy from the engine to the air, or in buildings, where radiators transfer heat energy from a furnace to the air and objects in the surrounding room.

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Other Word Forms

Noun Inflected Forms

• radiators
  plural

Etymology

Origin of radiator

First recorded in 1830–40; radiate + -or ²

Explanation

A room in an old house is often heated by a radiator, a metal device made up of pipes that circulate steam or hot water. If your house is heated with radiators, there will usually be one in each room, all connected to a central heating system. A radiator gets hot, and it sends that heat out into the room — in other words, it radiates heat. In fact, the word radiator originally meant "anything that radiates," including heat, light, or energy. By the 1850's, radiator had come to primarily mean "heater in a building or house."

Example Sentences

See Examples For:

radiator radiators

Even if the visible damage is limited to the hood, radiator and front bumper, there may be damage to other parts, including the cooling system, headlights, sensors and other important elements.

From MarketWatch ● Jul. 13, 2026

A Dyson swarm, by contrast, would consist of radiator panels rather than dust, giving it an unusually "clean" spectrum.

From Science Daily ● Jul. 10, 2026

A "closed-loop" water cooling system, which works a bit like a car radiator and does not require regular refills, prevents them from malfunctioning.

From Barron's ● Feb. 26, 2026

Dean Commodore publishes videos which help teach his nearly half a million followers on TikTok and Instagram how to perform tasks such as bleeding a radiator and hanging a mirror.

From BBC ● Feb. 23, 2026

With their backs only a foot from a steam radiator, the out-of-town reporters were sweating.

From "Snow Falling on Cedars: A Novel" by David Guterson

Ban daytime heat indoors: Appliances are secret radiators.

From MarketWatch ● Jun. 29, 2026

These data centers, along with their solar panels and radiators, cannot be launched in one piece and would need to be assembled in space.

From Science Daily ● Jun. 19, 2026

AI satellites would use radiators to get rid of heat produced by chips.

From The Wall Street Journal ● May 12, 2026

Whereas a gas boiler might heat water to 70C to run round your radiators, heat pumps work better at 45C.

From BBC ● Mar. 22, 2026

The heat was almost gone out of the radiators: the cold iron fluting stem signal and admonition for sleeping, the little death, the renewal.

From "Absalom, Absalom!" by William Faulkner

Related Words

• boiler
• fastball
• furnace
• oven
• stove