ventail

Having unhorsed this enemy and hacked him into submission, the knight rips off his foe's helmet and turns down the mail ventail (protecting the vulnerable throat), perhaps pounds the fellow's face a bit with the pommel of his sword; ...

Coordinate term: buffe

398. ventayles : a pun on ventails, 'something acting as a sail or fan', and ventails, the air holes or vents in the vizor of a helmet.