Pīeros (-us), i, m., = Πίερος. King of Emathia, who gave to his daughters the names of the nine Muses, Ov. M. 5, 302.

— A Macedonian, father of the nine Muses, Cic. N. D. 3, 21, 54; cf. Ov. Tr. 5, 3, 10.

— Hence, Pīeris, idis or idos, f., daughter of Pierus, a Muse, Hor. C. 4, 3, 18; Ov. F. 4, 222.

—In plur.: Pīerides, um, the Muses, Cic. N. D. 3, 21, 54; Verg. E. 8, 63; Juv. 4, 36.

— Pīerius, a, um, adj., Pierian, Thessalian; sacred to the Muses, poetic: quercus, from Mount Pierus, in Thessaly, Prop. 2, 10 (3, 4), 5: jugum, Phaedr. 3 prol. 17: nec vir Pieriā pellice saucius, Thessalian, Hor. C. 3, 10, 15: via, Ov. P. 2, 9, 62: modi, Hor. A. P. 405: chori, Ov. P. 1, 5, 58: dies, dedicated to the Muses, Stat. S. 1, 3, 23: tuba, an heroic poem, Mart. 10, 64, 4: frons, poet's brow, id. 8, 70, 5: corona, laurel, id. 12, 52, 1: grex, the Muses and poets, id. 12, 11, 4.

—Subst. plur.: Pīeriae, ārum, f., the Muses, Cic. N. D. 3, 21, 54.