si̍t-kó͘-thâu翼股頭

base of the wing

base of the wing (of a bird or insect)

English Wiktionary, “翼股頭” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E7%BF%BC%E8%82%A1%E9%A0%AD · confidence: Medium (Wiktionary)