radiator

noun4

1. •
   A device that lowers engine coolant temperature by conducting heat to the air, through metal fins.

   • The car overheated because of a broken radiator.
2. •
   A finned metal fixture that carries hot water or steam in order to heat a room.

   • The radiator kept the apartment warm during winter.
   • Steam hissed from the old iron radiator.
3. •
   Anything which radiates or emits rays.
4. •
   A type of antenna.