The headword is otherwise unattested (whether in the form printed by Adler, foiba/daion, or the variants of it in certain manuscripts, foiba/deon and foiba/drion). It could be the accusative of a man's name, Phoibadaios, but more probably it is an adjective (here in the masculine accusative singular or neuter nominative/accusative singular) connected with phi 776 and phi 777.