Lewis & Short

synŏdālis, e, adj. [synodus], of or belonging to a synod, synodal: Nemausum, Ven. Vit. S. Mart. 3, 415.
Subst.: synŏ-dālĭa, ĭum, n., constitutions of a synod, synodals, Ven. Vit. S. Mart. 3, 423.