death camp

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A concentration camp in which a large portion of the inmates are systematically put to death, are worked to death, or die from mistreatment.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A facility built during the Holocaust by the Nazis to kill especially the Jewish people through gassing.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a concentration camp where prisoners are likely to die or be killed