Source : Webster's Revised Unabridged Dictionary (1913)

Calorimeter \Cal`o*rim"e*ter\, n. [L. calor heat + -meter; cf.
   F. calorim[`e]tre.]
   1. (Physiol.) An apparatus for measuring the amount of heat
      contained in bodies or developed by some mechanical or
      chemical process, as friction, chemical combination,
      combustion, etc.

   2. (Engineering) An apparatus for measuring the proportion of
      unevaporated water contained in steam.

Source : WordNet®

calorimeter
     n : a measuring instrument that determines quantities of heat