LATIN DICTIONARYLexicon Latīnum
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“helmet” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

helmet
cassis, cassida (a helmet of metal): galea (γαλέη; a helmet of leather, and PROP. of the skin of a weasel: Tac., Germ., 6, paucis loricae, vix uni alterive cassis aut galea): cudo (κεύθων: a helmet of an unknown shape). To put on one’s helmet, sumere cassidem in caput (Plaut.): galeam inducere (Caes.): with a helmet on his head, cum casside; galeatus.

Quick answer

What is the Latin word for helmet?
The usual Latin words for “helmet” are cassus, cassis, galea; also cūdō, galeō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.