Definition of: radiator

(rā′dē·ā′tər) noun
1. That which radiates.
2. A chamber, coil, or flat hollow vessel, through which is passed steam or hot water for warming a building or apartment.
3. In engines, a nest of tubes for cooling water flowing through them.
—ra′di·a·to′ry (-ə·tôr′·ē, -tō′rē) adjective