n. One who or that which heats.n. Specifically— A furnace, stove, or other device for heating, drying, or warning buildings, rooms, drying-houses, fruit-evaporators, or parts of machines, as the calendering-rolls of a paper-mill.n. A small mass of cast-iron designed to be heated and then placed in a hollow fiat-iron or in a coffee-pot, to heat the iron or keep the coffee hot.n. In a sugar-making plant, a pan used for the first heating of the cane-juice or syrup; a heating-pan.n. In electricity, that part of the Nernst lamp which, in starting, is heated by the electric current and by its heat starts the glower. See Nernst lamp.