elmo
n. countable C2 Proficiency US //ˈɛɫmoʊ// el·mo
n. a helmet or a piece of head protection. In very old stories, it is the word used for the metal hat a knight wears in battle.
n. a helmet or headpiece, particularly one used in a historical or heraldic context. Archaic in general usage; primarily encountered in medieval literature or poetry.
The knight polished his elmo before the tournament.
The museum display featured a rusted elmo recovered from the site of a fourteenth-century battle.
In the epic poem, the hero's elmo was described as being forged from silver and topped with a plume of white feathers to signify his noble rank.
Usage
Archaic; modern English uses 'helmet' in almost all contexts.