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Meaning of hypogeum

hy•po•ge•um

Pronunciation: (hī"pu-jē'um, hip"u-), [key]
— pl. -ge•a
  1. the underground part of a building, as a vault.
  2. an underground burial chamber.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.