aventail(redirected from aventaile)
Also found in: Thesaurus.
Neck and shoulder mail that is attached to a helmet.
[Middle English aventaille, aventail, beaver of a helmet, from Anglo-Norman, probably alteration of esventail, aventail, from Old French esventer, to let out air, ventilate, from Vulgar Latin *exventāre; see vent1.]
the movable front flap on a helmet
a movable part on the lower front of a medieval helmet.