Lewis & Short

embŏlismus, a, um, adj., = ἐμβολισμός, intercalary: dies, Sol. 1, § 42: annus, leap-year, Isid. Orig. 6, 17, 21 sq.
As subst.: embolismus, i, m., the interposition, intercalation, Isid. 6, 17, 23.