Casque
/kæsk/noun
A helmet, especially one of metal or a decorative military helmet.
Did you know?English *casque* entered through French, and its deeper root is often linked to Latin *cassis* (“helmet”), a word that may be connected to the idea of something hard and shell-like rather than anything mystical at all.
Etymological Timeline
Proto-Indo-European
PIE
*ḱes-
“To cut or split; a possible ancient source for words connected with shells, coverings, or hard outer forms.”
Latin
Latin
cassis
“A helmet or protective headpiece.”
Old French
Old French
casque
“A helmet, especially a military one.”
16th Century
English
casque
“A helmet or protective head covering, especially a decorative or military one.”
Modern English
English
casque
“A helmet, especially one of metal or a decorative military helmet.”