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radiator (n.)

1836, "any thing which radiates," agent noun in Latin form from radiate (v.). The meaning "apparatus designed to communicate heat to a room" is from 1851; sense of "cooling device in an internal combustion engine" is by 1900.

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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