Utre (gender unknown)
(with) definite article: ? [?]: l’air reservoir: flexible (usually of animal skin), ready for the insertion of stocks
From Latin "ǔter" [goatskin / leather bag; wineskin].
Usually made of goatskin, more rarely of sheep.
Tucci, Roberta: Le zampogne in Calabria. In: La zampogna: gli aerofoni a sacco in Italia (2005), II, p.97.