03/04/2019 8:40:00 03/04/2019 8:40:00 Defmean 03/04/2019 8:40:00 Reheater Reheater Reheater Share on What is Reheater?Reheater definition and meaning on Dictionary terms: nounany of various apparatus for heating, especially for heating water or the air in a room. Electronics. the element of a vacuum tube that carries the current for heating a cathode. Slang. a pistol, revolver, or other firearm.