Aventail

Av'en·tail noun [ Old French esventail . Confer Ventail .] The movable front to a helmet; the ventail.
Found on http://www.encyclo.co.uk/webster/A/151

Aventail

• (n.) The movable front to a helmet; the ventail.
Found on http://thinkexist.com/dictionary/meaning/aventail/

Aventail

Part of armour, a kind of mail curtain, fastened to the edges of the helmet with staples called vervelles. It covered the neck and the shoulders. Sometimes called as camail.
Found on http://web.ceu.hu/medstud/manual/SRM/gloss.htm

Aventail

An aventail or camail is a flexible curtain of mail attached to the skull of a helmet that extends to cover the throat, neck and shoulders. Part or all of the face, with spaces to allow vision, could also be covered. The earliest camails were riveted directly to the edge of the helmet, however, beginning in the 1320s in Western Europe a detachable...
Found on http://en.wikipedia.org/wiki/Aventail

aventail

movable front of a helmet
Found on http://phrontistery.info/a.html
No exact match found