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Noun heater has 2 senses
- heater, warmer - device that heats water or supplies warmth to a room
--1 is a kind of device
--1 has particulars:
- fastball, heater, smoke, hummer, bullet - (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke"
--2 is a kind of pitch, delivery
--2 has particulars: slider