| n. | 1. | One who, or that which, heats. | |||
| 2. | Any contrivance or implement, as a furnace, stove, or other heated body or vessel, etc., used to impart heat to something, or to contain something to be heated. | ||||
| 3. | A pistol or other carryable firearm;
| ||||
| Noun | 1. | heater - device that heats water or supplies warmth to a room Synonyms: warmer |
| 2. | heater - (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke" |