Corniaule (f)
(with) definite article: lapiece of strong leather, at elbow level of the bag, that guarantees the passage of air
Chassaing, Jean-François: La tradition de cornemuse en Basse-Auvergne et Sud-Bourbonnais [Thèse de doctorat, ethnologie 3e cycle, Univ. Lyon 2, 1981]. Moulins, 1983 (© 1982), p.78.