catacomb
noun
Usually catacombs. an underground cemetery, especially one consisting of tunnels and rooms with recesses dug out for coffins and tombs.
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Basilicas and catacumbal churches—Preference of the people for the latter—The cult of martyrs encouraged this—Crypts—Elevation of relics—Church of SS.
From Castles and Cave Dwellings of Europe by S. (Sabine) Baring-Gould