regenerator
noun
re·gen·er·a·tor ri-ˈje-nə-ˌrā-tər 
1
: one that regenerates
2
: a device used especially with hot-air engines or gas furnaces in which incoming air or gas is heated by contact with masses (as of brick) previously heated by outgoing hot air or gas
Example Sentences
Recent Examples on the Web Way back in our evolutionary past, the common ancestors of people and salamanders could have been regenerators, since at least one distant relative of modern-day salamanders could do it. 
Amber Dance, Smithsonian Magazine, 31 Jan. 2020 Invaders and regenerators Indigenous to the eastern United States, the eastern gray squirrel was eradicated from New York City sometime before the 1840s, and was later reintroduced to American cities in the mid-19th century. Kaitlyn Schwalje, National Geographic, 20 June 2019 The animals are crucial players in their environments, both as food for predators and regenerators of their home forests. Christine Dell'amore, National Geographic, 22 Apr. 2019 If only the media had a roast chicken collusion regenerator. Fox News, 20 May 2018 That solution is pumped to a regenerator, or stripper, which heats the amine and releases the CO2. John Schwartz, New York Times, 2 Jan. 2017
Amber Dance, Smithsonian Magazine, 31 Jan. 2020 Invaders and regenerators Indigenous to the eastern United States, the eastern gray squirrel was eradicated from New York City sometime before the 1840s, and was later reintroduced to American cities in the mid-19th century. Kaitlyn Schwalje, National Geographic, 20 June 2019 The animals are crucial players in their environments, both as food for predators and regenerators of their home forests. Christine Dell'amore, National Geographic, 22 Apr. 2019 If only the media had a roast chicken collusion regenerator. Fox News, 20 May 2018 That solution is pumped to a regenerator, or stripper, which heats the amine and releases the CO2. John Schwartz, New York Times, 2 Jan. 2017 Word History
First Known Use
1538, in the meaning defined at sense 1