אַו
From LSJ
καί τιν᾿ ὀίω αἵματί τ' ἐγκεφάλῳ τε παλαξέμεν ἄσπετον οὖδας ἀνδρῶν μνηστήρων, οἵ τοι βίοτον κατέδουσιν → and I think some one of the suitors that devour your property shall bespatter the vast earth with his blood and brains
English (Strong)
presumed to be the "constructive" or genitival form of -av; short for אַוַּת; desire (and so probably in Prov. 31:4); hence (by way of alternative) or, also if: also, and, either, if, at the least, X nor, or, otherwise, then, whether.
