ὑπόγειος · hypogeios — LSJ
underground, subterraneous, mines, stored in a cellar
underground, subterraneous, οἴκημα ὑπόγαιον Hdt. 2.100, 148 (vv.ll. -γεον, -γεα) ὀρύγματα ὑπόγαια mines, Id. 4.200 (v.l. -γεα) ; ὑπογαίου (v.l. -γείου) βροντῆς A. Fr. 57.10 (anap.); ὑπόγειον ὕδωρ Gp. 2.6.33; ὑ. οἶνος stored in a cellar, Gal. 19.95.
II an underground chamber
ὑπόγειον or -γαιον, τό, an underground chamber, Plu. Amat. 2.770e, Hdn. 1.15.6.
III under the earth, the nadir
Astron., under the earth, Man. 3.27, Gp. 1.7.1; [ἄστρα] τὴν ὑ. φορὰν ἐνεχθέντα Placit. 1.6.8: τὸ ὑ. the nadir, Vett.Val. 75.24.—The form ὑπόγεως, ων, cited in Hdn. Epim. 208 and Suid., occurs in codd. of Paus. 2.2.1, 2.36.7; cf. ὑπογάιδιον.