D defs.my
Entry 1 sense Webster, 1913

Catacomb

/kăt'-ək-ōmˌ/ · Cat·a·comb · IPA /ˈkætəkoʊm/
01 n. A cave, grotto, or subterraneous place of large extent used for the burial of the dead; -- commonly in the plural.
  1. 1.
    A cave, grotto, or subterraneous place of large extent used for the burial of the dead; -- commonly in the plural.