οἷο
From LSJ
ὁκόσα γὰρ ὑπὰρ ἐκτρέπονται ὁποίου ὦν κακοῦ, τάδε ἐνύπνιον ὁρέουσι ὥρμησε → for whatever, when awake, they have an aversion to, as being an evil, rushes upon their visions in sleep (Aretaeus, Causes & Symptoms of Chronic Disease 1.5.6)
English (LSJ)
Ep. for οὗ, gen. of Possess. Pron. ὅς, ἥ, ὅν
A his, her (q. v.) : οἷόπερ, Ep. for οὗπερ, A.R.1.1325.
