What is the meaning of Heater?

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

A person who heats something, for example in metalworking.

A gun.

A fastball, especially one thrown at high velocity.

An extended winning streak.

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

A dead heat; a race in which two or more competitors reach the finish line simultaneously.

Alternative form of hater

Source: wiktionary.org