Definition of "regenerator" [re•gen•er•a•tor]

• One who, or that which, regenerates. (noun)
• 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. (noun)

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• "It is certain, however, that so-called regenerator furnaces of various forms have, from time to time, been brought into use at gas works for the purpose in question both on the"
• "Wilson's Hair Dressing," a hair "regenerator," which claimed to restore graying hair to its original color and was sold in smart green glass bottles that were advertised widely in newspapers throughout New England, New York and New Jersey, including the New York Times."
• "But without the cellular regenerator and biobed systems—"