charnel house

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A building, room, or vault in which the bones or bodies of the dead are placed; a charnel.
2. n. A scene or place of great physical suffering and loss of life: The bombing turned the barracks into a charnel house.

Century Dictionary and Cyclopedia

1. n. A place, usually under or near a church, where the bones of the dead are deposited; formerly, and still in parts of Brittany, a kind of portico or gallery, in or near a churchyard, over which the bones of the dead were laid after the flesh was consumed.

Wiktionary

1. n. a vault or other building in which the bones of the dead are stored

GNU Webster's 1913

1. adj. 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.

WordNet 3.0

1. n. a vault or building where corpses or bones are deposited