The Collaborative International Dictionary of English v.0.48:

Mortuary \Mor"tu*a*ry\, a. [L. mortuarius, fr. mortuus dead: cf.
   F. mortuaire. See Mortal.]
   Of or pertaining to the dead; as, mortuary monuments.
   [1913 Webster]

   Mortuary urn, an urn for holding the ashes of a dead person
      after cremation.
      [1913 Webster]