The Collaborative International Dictionary of English v.0.48:

Charnel \Char"nel\, a. [F. charnel carnal, fleshly, fr. L.
   carnalis. See Carnal.]
   Containing the bodies of the dead. "Charnel vaults."
   --Milton.
   [1913 Webster]

   Charnel house, a tomb, vault, cemetery, or other place
      where the bones of the dead are deposited; originally, a
      place for the bones thrown up when digging new graves in
      old burial grounds.
      [1913 Webster]

WordNet (r) 3.0 (2006):

charnel house
    n 1: a vault or building where corpses or bones are deposited
         [syn: charnel house, charnel]