Regenerator

noun

1. A lamp which generates formaldehyde by the oxidation of methyl alcohol.
2. Ono who regenerates.
3. In metallurgy, a chamber filled with a checker-work of fire-bricks; that part of a regenerative furnace in which the waste heat of the gases escaping from the hearth is, by reversal of the draft at suitable intervals, alternately stored up and given out to the gas and air entering the furnace.
4. One who, or that which, regenerates.
5. A device used in connection with hot-air engines, gas-burning furnaces, etc., in which the incoming air or gas is heated by being brought into contact with masses of iron, brick, etc., which have been previously heated by the outgoing, or escaping, hot air or gas.