Kule (gender unknown)
air reservoir: flexible (usually of animal skin), ready for the insertion of stocks
According to Muktupāvels, “the term denotes the air chamber of the instrument.“; NB: ➺ Kulenes and Somas stabules.
Muktupāvels, Valdis: Latviešu mūzikas instrumentu sistemātika [Thesis]. Rīga, 1999, p.114.