The Collaborative International Dictionary of English v.0.48:
Reheat \Re*heat"\ (r?*h?t"), v. t. 1. To heat again. [1913 Webster] 2. To revive; to cheer; to cherish. [Obs.] --Rom. of R. [1913 Webster]WordNet (r) 3.0 (2006):
reheat v 1: heat again; "Please reheat the food from last night"