heater

noun

1. 1

   A device that produces and radiates heat, typically to raise the temperature of a room or building.

   “Turn on the heater; I'm cold.”

2. 2

   A person who heats something, for example in metalworking.

3. 3

   A gun.

   “The thug pumped two rounds from his heater into her.”

4. 4

   A fastball, especially one thrown at high velocity.

   “Jones threw a heater under his chin.”

5. 5

   An extended winning streak.

   “Emmy went on a heater in Las Vegas and came back six thousand dollars richer.”

6. 6

   A medieval European shield having a rounded triangle shape like a clothes iron.