1. ὑποπετρίδιος · hypopetridios — Beekes
ὑποπετρίδιος [adj.] ‘winged’. *VAR In ὑποπετριδίων ὀνείρων ‘winged dreams’ (Alcm.); variant ὑποπτερίδιος (Dionys. apud EM 783, 20f.). *ETYM Derived from ὑπόπτερος ‘winged’ (Pi, Ion. Att), see »πτερόν, the IE cognates of which go back to PIE *petr-. Therefore, the Alcman variant ὑποπετρidtog could in theory preserve the PIE sequence *petr-. Yet, since this would require separating ὑποπετρίδιος from all other … — [Beekes, s.v. ὑποπετρίδιος, p. 1587]