/huy'peuh jee"euhm, hip'euh-/ , n. , pl. hypogea /-jee"euh/ .
1. Anc. Archit. the underground part of a building, as a vault.
2. an underground burial chamber.
[ 1700-10; hypogeum hypógeion underground chamber (neut. of hypógeios underground), equiv. to hypo- HYPO- + gê earth + -ion neut. adj. suffix ]