1. [adj]  of or relating to calories in food; "comparison of foods on a caloric basis"; "the caloric content of foods"
2. [adj]  relating to or associated with heat; "thermal movements of molecules"; "thermal capacity"; "thermic energy"; "the caloric effect of sunlight"

CALORIC is a 7 letter word that starts with C.

1. \Ca*lor"ic\, n. [L. calor heat; cf. F. calorique.]
   (Physics)
   The principle of heat, or the agent to which the phenomena of
   heat and combustion were formerly ascribed; -- not now used
   in scientific nomenclature, but sometimes used as a general
   term for heat.
   
         Caloric expands all bodies.              --Henry.
   
   

2. \Ca*lor"ic\, a.
   Of or pertaining to caloric.
   
   {Caloric engine}, a kind of engine operated by heated air.