heater
//ˈhiːtər//
Noun
heaterSingular
heatersPlural
1
A device used to produce heat, especially for warming a room or building.
I turned on the heater because the room was cold.
2
A person or thing that heats something.
This device acts as a water heater for the swimming pool.
3
(slang) A firearm, especially a handgun.
The detective found a heater hidden under the suspect's jacket.
4
(baseball) A fastball pitch.
The pitcher threw a heater right down the middle.