πτέρυξ, πτέρυγος, ἡ (πτερόν a wing), from Homer down, the Sept. often for כָּנָף; a wing: of birds, Matthew 23:37: Luke 13:34; Revelation 12:14; of imaginary creatures, Revelation 4:8; Revelation 9:9.
From a derivative of petomai (meaning a feather); a wing -- wing.
NAS: under her wings, and you were unwilling.