ἀκρόπτερον
From LSJ
Δυσαμένη δὲ κάρηνα βαθυκνήμιδος ἐρίπνης / Δελφικὸν ἄντρον ἔναιε φόβῳ λυσσώδεος Ἰνοῦς (Nonnus, Dionysiaca 9.273f.) → Having descended from the top of a deep-greaved cliff, she dwelt in a cave in Delphi, because of her fear of raving/raging Ino.
English (LSJ)
τό,
A quill, AP6.229 (Crin.); ἀκρόπτερα φωτῶν flanking men of a hunting-party, Opp.C.4.127.
German (Pape)
[Seite 84] τό, Flügelspitze, Crinag. 5 (VI, 229); aber ἀνέρες Opp. C. 4, 127 Männer auf der äußersten Spitze.