signātōrĭus — Lewis & Short
signātōrĭus, a, um, adj.id.,
I of or belonging to sealing:
anulus,a seal-ring, Val. Max. 8, 14, 4; Dig. 50, 16, 74; 34, 2, 25, § 10.—Subst.: signātōrĭum, ii, n., a sealing, Alcim. Ep. 78.