For the two meanings of the headword adjective given here, see LSJ s.v. e)nne/wros (with a third, 'nine hours long', from w(/ra rather than w(=ros). Both occur in Homer, e.g. Odyssey 19.179 on Minos -- a line quoted in [Plato], Minos 319B, where the scholia gloss it as here. See also the scholia to Homer, Iliad 18.351, and other lexica.