The headword phrase, in the nominative singular, joins the commonplace noun a)/nqrwpos with the adjective o(lkos; cf. omicron 178, omicron 179, and see generally LSJ s.v. (For the identical noun, see omicron 175, omicron 176, omicron 180.)
The phrase is attested only in lexicography; see already Photius omicron228 Theodoridis, citing the comparable entry in the Lexica Segueriana (Anonymus Antiatticista 111.1) but omitting the same one in Timaeus, Platonic Lexicon 997a24. Both Timaeus and the A.A. add 'Plato in [book] 5 of Republic'. This presumably means Republic 521D (web address 1), where however the context is not attractive human being, but ma/qhma yuxh=s o(lko/n, a discipline which attracts the soul. Neither that passage nor further instances of o(lko/n in 524E and 527B solve the mystery of this lemma.