'aventayle' originates from Middle English, specifically the word 'aventayle' (a variant spelling), ultimately from Old French 'aventaille' (or 'aventail'), where elements relate to 'avant' meaning 'before' or 'front' and a suffix denoting a covering or piece (used for protective equipment).

'aventayle' changed from Old French 'aventaille' (and related medieval forms) and through Middle English spellings became the modern English variant 'aventail' (with 'aventayle' preserved as an archaic/alternate form).

Initially it referred generally to a frontal covering or protective hanging attached to a helmet; over time the term stabilized to mean specifically the mail or curtain that protects the throat and neck of a helmet wearer.