1. any object that radiates energy

Definition categories: object

2. heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings

Definition categories: man–made, heater, warmer

3. 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

Definition categories: man–made, mechanism