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The Collaborative International Dictionary of English v.0.48 (gcide)

Catacomb \Cat"a*comb\, n. [It. catacomba, fr. L. catacumba perh.
from Gr. kata` downward, down ky`mbh cavity.]
A cave, grotto, or subterraneous place of large extent used
for the burial of the dead; -- commonly in the plural.
[1913 Webster]

Note: The terms is supposed to have been applied originally
to the tombs under the church of St. Sebastian in Rome.
The most celebrated catacombs are those near Rome, on
the Appian Way, supposed to have been the place or
refuge and interment of the early Christians; those of
Egypt, extending for a wide distance in the vicinity of
Cairo; and those of Paris, in abandoned stone quarries,
excavated under a large portion of the city.
[1913 Webster]