Definitions
1.NounA device that produces and radiates heat, typically to raise the temperature of a room or building."Turn on the heater; I'm cold."
2.NounA person who heats something, for example in metalworking.
3.NounA gun."The thug pumped two rounds from his heater into her."
4.NounA fastball, especially one thrown at high velocity."Jones threw a heater under his chin."
5.NounAn extended winning streak."Emmy went on a heater in Las Vegas and came back six thousand dollars richer."
6.NounA medieval European shield having a rounded triangle shape like a clothes iron.
7.NounA dead heat; a race in which two or more competitors reach the finish line simultaneously.
8.Noun(The addition of quotations indicative of this usage is being sought:) Synonym of banger (“a powerfully energetic or exceptional song”).