ὀμφαλόεις
From LSJ
αἰθὴρ δ᾽ ἐλαφραῖς πτερύγων ῥιπαῖς ὑποσυρίζει (Aeschylus, Prometheus Bound 126) → The bright air fanned | whistles and shrills with rapid beat of wings.
English (LSJ)
εσσα, εν,
A having a navel or boss, ἀσπίδος -οέσσης of the shield with a central boss, Il.6.118, Tyrt.12.25, cf.Ar.Pax1274 ; ζυγὸν-όεν yoke with a knob on the top, Il.24.269, cf. ὀμφαλός 11.2 ; οἰμωγὰς -οέσσας Ar.Pax1278 (by comic transference from ἀσπίδας ὀ. ib. 1274) ; συκέης πόσιν -όεσσαν, prob. referring to a peculiar kind of fig (called ὀμφάλειος by Phot.), Nic.Al.348 ; ἄρκτον-όεσσαν, because pointing to the pole (ὀμφαλός) of the heavens, ib.7.