from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A subterranean chamber of an ancient building.
- n. An ancient subterranean burial chamber, such as a catacomb.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An underground room or cavern (also used figuratively).
from the GNU version of the Collaborative International Dictionary of English
- n. The subterraneous portion of a building, as in amphitheaters, for the service of the games; also, subterranean galleries, as the catacombs.
from The Century Dictionary and Cyclopedia
- n. In architecture, that part of a building which is below the level of the ground, including cellars, vaults, etc.; also, any underground construction, chamber, etc., as the syringes of ancient Egypt, or the tombs of the Etruscans. Also hypogee.
Latin hypogēum, from Greek hupogeion, from neuter of hupogeios, underground; see hypogeal.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin hypogaeum, from Ancient Greek ὑπόγειον, a noun use of the neuter singular of ὑπόγειος ("underground"). (Wiktionary)