Utero (m)
(with) definite article: il: l’air reservoir: flexible (usually of animal skin), ready for the insertion of stocks
From Latin "ǔter" [goatskin / leather bag; wineskin]; Term in the dialect spoken in the Val d’Agri [SE of Potenza].
Scaldaferri, Nicola: La zampogna in Basilicata. In: La zampogna: gli aerofoni a sacco in Italia (2005), II, p.59.