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Noun heater has 2 senses
  1. heater, warmer - device that heats water or supplies warmth to a room
    --1 is a kind of device
    --1 has particulars:
     brazier, brasier; convector; defroster, deicer; demister; gas heater; heating pad, hot pad; oil heater, oilstove, kerosene heater, kerosine heater; radiator; solar heater; space heater; stove; water heater, hot-water heater, hot-water tank
    Derived forms: verb heat2, verb heat1
  2. 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
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