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. A gun.
    The thug pumped two rounds from his heater into her.
  3. A fastball.
    Jones threw a heater under his chin.
  4. An extended winning streak.
    Emmy went on a heater in Las Vegas and came back six thousand dollars richer.

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