
1) An underground burial chamber
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https://www.crosswordclues.com/clue/hypogeum

underground chamber
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http://phrontistery.info/h.html

• (n.) The subterraneous portion of a building, as in amphitheaters, for the service of the games; also, subterranean galleries, as the catacombs.
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http://thinkexist.com/dictionary/meaning/hypogeum/

In archaeology, an underground chamber used as a burial place. With varying construction, they may be dug from the earth; cut from rock, as in the Roman
catacombs; or built of masonry, as at...
Found on
http://www.encyclo.co.uk/local/20688
Hyp`o·ge'um noun ;
plural Hypogea . [ Latin , from Greek ..., ..., 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.
Found on
http://www.encyclo.co.uk/webster/H/83

the underground part of a building, as a vault. · an underground burial chamber.
Found on
https://www.infoplease.com/dictionary/hypogeum
No exact match found.