Etymology
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radiator (n.)

1832, "any thing which radiates," agent noun in Latin form from radiate (v.). Originally a stove-like apparatus, as a device designed to communicate heat from steam to a room by 1855; the sense of "cooling device in an internal combustion engine" is by 1899.

updated on November 12, 2021

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Definitions of radiator from WordNet

radiator (n.)
any object that radiates energy;
radiator (n.)
heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings;
radiator (n.)
a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan;
From wordnet.princeton.edu, not affiliated with etymonline.