出典:Wiktionary
From Ancient Greek ὀξέᾱ (oxéā). Either from the Ionic form of Attic ὀξεῖᾰ (oxeîa), (a feminine form of ὀξῠ́ς (oxús, “sharp”) applied to ῥᾰ́βδος (rhábdos, “wand; shaft”))[1] or a variant of ὀξῠ́ᾱ (oxúā), ὀξῠ́η (oxúē, “beech; spear-shaft”).[2]