Iāpydes, um, m., = Ἰάπυδες, a people of Illyria, in the present military frontier of Croatia, Plin. 3, 18, 22, § 127; Liv. 43, 5; Cic. Balb. 14, 32.

— Hence, Iāpys, ydis, adj., of or belonging to the Iapydes: Iapydis arva Timavi, Verg. G. 3, 475.

— Iāpydia, the country of the Iapydes, Plin. 3, 21, 25, § 140; Tib. 4, 1, 108; called Iāpu-dia, Sall. H. Fragm. 1, 11 Dietsch.