Definitions for ventailˈvɛn teɪl
Random House Webster's College Dictionary
a movable part on the lower front of a medieval helmet.
Origin of ventail:
1300–50; ME < MF ventaille=vent (< L ventuswind1) +-aille -al2
camail, aventail, ventail(noun)
a medieval hood of mail suspended from a basinet to protect the head and neck
A piece of armour used to protect the neck.
The movable front part of a helmet, originally including the visor but later specifically the separate lower section.
That part of a mediaeval helmet which is intended for the admission of air.
that part of a helmet which is intended for the admission of air, -- sometimes in the visor