1. (noun) any object that radiates energy

• natural object

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

• heater
• warmer

3. (noun) 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

• mechanism

1. (noun) any object that radiates energy

• radio source

1. (noun) any object that radiates energy

• radiate