n. 盔

[ noun ]
(15-16th century) any armor for the head; usually ornate without a visor
<noun.artifact>

Casque \Casque\ (k[.a]sk), n. [F. casque, fr. Sp. casco See
{Cask}.]
A piece of defensive or ornamental armor (with or without a
vizor) for the head and neck; a helmet.

His casque overshadowed with brilliant plumes.
--Prescott.