radiator

(n): an object occurring naturally; not made by man

(n): heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings

(n): device that heats water or supplies warmth to a room

(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

(n): device consisting of a piece of machinery; has moving parts that perform some function