Hyp`o*ge"um (?), n.; pl. Hypogea (#). [L., fr. Gr. , , subterranean; under + , , the earth.] Anc. Arch.
The subterraneous portion of a building, as in amphitheaters, for the service of the games; also, subterranean galleries, as the catacombs.
© Webster 1913.