ven·tail /ˈvɛnˌtel/
Vent·ail n. That part of a helmet which is intended for the admission of air, -- sometimes in the visor.
Her ventail up so high that he descried
Her goodly visage and her beauty's pride. --Fairfax.
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ventail
n : a medieval hood of mail suspended from a basinet to protect
the head and neck [syn: camail, aventail]