hypogeum
Could not find hypogaeo in Logeion dictionaries.
hypogaeo neuter dative singular, neuter ablative singular of hypogeum
hypogēum, ī, n. (ὑπόγειον), ein unterirdisches Gewölbe, Kellergeschoß, Vitr. 6, 8, 1. Vgl. hypogaeum.
hўpŏgēum, ī, n. (ὑπόγειον), construction souterraine, cave : Vitr. Arch. 6, 11 || caveau [pour les morts], hypogée : Petr. 111, 2.