ἱππούραιον
From LSJ
ἑτέρως ἠδύνατο βέλτιον ἢ ὡς νῦν ἔχει κατεσκευάσθαι → otherwise they could have been constructed better than they are now (Galen, On the use of parts of the body 4.143.1 Kühn)
English (LSJ)
τό,= ἵππουρος, A horse-tail, Arat.438.
German (Pape)
[Seite 1261] τό, = ἵππουρις, bei Arat. 438 der Pferdeschweif.