ἱπποθόρος
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)
ὁ, (θόρνυμι)
A covering mares, esp. of a he-ass kept for breeding mules, Hsch. II as Adj., ἱ. νόμος a tune played to a mare, while she was being covered, Plu. 2.138b,704f.