A.plinth, pedestal, Supp.Epigr.6.319 (Laodicea Combusta).
II. metaph., “ὑ. τῶν συλλογισμῶν” S.E.P.2.166, cf. Procl.Inst.71; “αἱ τῶν ἄλλων τεχνῶν ὑ. τε καὶ ἀρχαί” Aristid.Quint.3.10; “ἡ ὕλη ὑ. καὶ ἕδρα δοκεῖ τῷ εἴδει εἶναι” Plot.6.3.4, cf. Ruf.Anat.2.
2. pl., ὑποβάθραι stages in the pursuit of virtue, Max.Tyr.40.4.