catacomb
noun
cat·a·comb
ˈka-tə-ˌkōm
1
: a subterranean cemetery of galleries with recesses for tombs
—usually used in plural
2
: something resembling a catacomb: such as
a
: an underground passageway or group of passageways
b
: a complex set of interrelated things
the endless catacombs of formal education—Kingman Brewster †1988
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Merriam-Webster unabridged
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