reheater

noun
re·​heater | \ (ˈ)rē+\

Definition of reheater

: one that reheats: such as
a : a furnaceman who reheats metal
b : a receiver furnished with means for heating the steam in a compound engine or turbine
c : an apparatus for reheating compressed air before use to prevent excessively low temperatures due to expansion

History and Etymology for reheater

re- + heater

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