The Collaborative International Dictionary of English v.0.48:

Camail \Ca*mail"\, n. [F. camail (cf. It. camaglio), fr. L.
   caput head + source of E. mail.]
   1. (Ancient Armor) A neck guard of chain mall, hanging from
      the bascinet or other headpiece.
      [1913 Webster]

   2. A hood of other material than mail; esp. (Eccl.), a hood
      worn in church services, -- the amice, or the like.
      [1913 Webster] Camara dos Pares
      Camara

WordNet (r) 3.0 (2006):

camail
    n 1: a medieval hood of mail suspended from a basinet to protect
         the head and neck [syn: camail, aventail, ventail]