The Collaborative International Dictionary of English v.0.48:

canopic jar \ca*no"pic jar`\ n.
   a jar used in ancient Egyptian tombs to contain the
   intestines of a person who was mummified for burial; -- also
   called canopic vase. [Also spelled Canopic jar.]
   [PJC]

WordNet (r) 3.0 (2006):

canopic vase
    n 1: a jar used in ancient Egypt to contain entrails of an
         embalmed body [syn: canopic jar, canopic vase]