reheating

To heat something after it has cooled off, especially previously cooked food (also in figurative senses).

“I’m reheating some leftovers for dinner.”

To become hot again after having cooled off (also in figurative senses).

“He put the soup on the stove to reheat.”

Alternative form of rehete

The act of making something hot again.

“The crucible was subjected to several reheatings.”