Compositional etymology starting from κέρας in the meaning "hair", and accounting for the diphthong of the present stem κείρω by a second etymon, αἴρω "to lift up", in the derived meaning of "to take away, to remove". The verb thus amounts to the full syntagm verb + object "to remove the hair". This etymology implies heavy formal manipulations, and the detail is not provided in Orion. Presumably the process was understood do be *κεαίρω, with only the first syllable of κέρας kept, and then a contraction of εαι into ει (this one was known to Greek grammarians, who one that for instance the ending of the 2sg M was in Homer -εαι whereas it is in koine -ει)