The Collaborative International Dictionary of English v.0.48:

bomb calorimeter \bomb" cal`o*rim"e*ter\, n.
   a type of calorimeter made of a steel body which closes
   tightly and resists high pressure, designed for measuring the
   amount of heat developed durng chemical combustion of a
   quantity of combustible material in an oxygen atmosphere.
   [PJC]

WordNet (r) 3.0 (2006):

bomb calorimeter
    n 1: strong sealed vessel for measuring heat of combustion [syn:
         bomb calorimeter, bomb]