Bible Encyclopedias
Aventail

1911 Encyclopedia Britannica

or Avantaille Fr. esventail, presumably from a Latin word exventaculum, air-hole), the mouthpiece of an oldfashioned helmet, movable to admit the air.

Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Aventail'. 1911 Encyclopedia Britanica. https://www.studylight.org/​encyclopedias/​eng/​bri/​a/aventail.html. 1910.