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plural aventails
A curtain or flap of chainmail, fastened to a helmet, or to a coif (hood) of mail, covering the lower face, neck, and shoulders. quotations examples
[…] the hood was increasingly replaced with a mail curtain (the camail or aventail) suspended from the outside of the bascinet, and the bascinet thus augmented gradually replaced the clumsy great helm as the principal defense […]
1995, William W. Kibler, Medieval France: An Encyclopedia, Psychology Press, page 126
Synonym of ventail (“movable (solid plate) front to a helmet”). examples