The headword is the feminine nominative (and vocative) singular form of the adjective o)loo/s, -h/, -o/n; see generally LSJ s.v., and cf. omicron 195. It is extracted from a scholion (= D scholia) to Homer, Iliad 22.5 (web address 1), where a o)loih\ moi=ra (deadly fate) ensnares Hector. The scholiast transmits the present headword with the same gloss (see next note); the original verse contains the relatively uncommon Ionic and epic form o)loih/, and the remaining instances in Homer, two in the Iliad and five in the Odyssey, are in fact moi=r’ o)loh/; Richardson, pp. 106-7.
[1] The glossing adjective is the same form as the lemma; LSJ s.v. o)le/qrios. The headword is identically glossed in Hesychius omicron601 (where Latte cites Iliad 21.83), and similarly glossed in Etymologicum Magnum 622.25 (Kallierges), ps.-Zonaras 1443.22, and Etymologicum Gudianum 426.45 (Sturz).