pseudo-isidorian adjective orpseudo-isidorean\“+\; orpseudo-isidoran\| ̷ ̷(ˌ) ̷ ̷|izəˈdōrən\ Usage: often capitalized P & usually capitalized I : of, relating to, or constituting a 9th century collection of decretals, decisions of councils, and letters consisting chiefly of forged documents held to have been compiled by St Isidore of Seville