What's the difference between aventail and camail?

Aventail

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Definition:

• (n.) The movable front to a helmet; the ventail.

Example Sentences:

Camail

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Definition:

• (n.) A neck guard of chain mall, hanging from the bascinet or other headpiece.
• (n.) A hood of other material than mail;
• (n.) a hood worn in church services, -- the amice, or the like.

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