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From The Collaborative International Dictionary of English v.0.48:
Ventail \Vent"ail\ (v[e^]nt"[=a]l), n. [OF. ventaille, F. ventail. See Ventilate, and cf. Aventail.] That part of a helmet which is intended for the admission of air, -- sometimes in the visor. --Spenser. [1913 Webster] Her ventail up so high that he descried Her goodly visage and her beauty's pride. --Fairfax. [1913 Webster]