Source : Webster's Revised Unabridged Dictionary (1913)

Reheat \Re*heat"\ (r?*h?t"), v. t.
   1. To heat again.

   2. To revive; to cheer; to cherish. [Obs.] --Rom. of R.

Source : WordNet®

reheat
     v : heat again; "Please reheat the food from last night"