I.a helmet, commonly of metal (as galea was of leather, Isid. Orig. 18, 14, 1; cf. Tac. G. 6), Plaut. Trin. 3, 2, 100; Caes. B. G. 7, 45; Ov. M. 12, 89; 13, 107: “fracta,” Juv. 10, 134: “caelata,” id. 11, 103.—But also promiscuously for galea, Ov. M. 8, 25 (cf.: “aerea galea,” Verg. A. 5, 490).—
b. Meton., war: “sub casside sumere unguenta,” Plin. 13, 3, 4, § 23: “aetas patiens cassidis,” Juv. 7, 33.