ἱππούραιον
From LSJ
ὡς μήτε τὰ γενόμενα ἐξ ἀνθρώπων τῷ χρόνῳ ἐξίτηλα γένηται → in order that so the memory of the past may not be blotted out from among men by time
English (LSJ)
τό, = ἵππουρος, horse-tail, Arat.438.
German (Pape)
[Seite 1261] τό, = ἵππουρις, bei Arat. 438 der Pferdeschweif.