'armet' originates from Old French, specifically the word 'armet', where 'arme' related to 'arms' or 'weapons' (from Latin 'arma' meaning 'arms').

'armet' changed from Old French 'armet' into Middle English usage as 'armet' and eventually became the modern English word 'armet' used to denote this specific type of helmet.

Initially, it referred more generally to a piece of armour or protective gear associated with 'arms'; over time it narrowed to the specific meaning of 'a close-fitting medieval helmet.'