The Collaborative International Dictionary of English v.0.48:

Ossuary \Os"su*a*ry\, n.; pl. -ries. [L. ossuarium, fr.
   ossuarius of or bones, fr. os, ossis, bone: cf. F. ossuaire.]
   A place where the bones of the dead are deposited; a charnel
   house. [Obs.] --Sir T. Browne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ossuary
    n 1: any receptacle for the burial of human bones