Bordoncillo (m)
(with) definite article: elDiminutive of Bordón; Generic term, used by musicologists, &c.
Meré, Rafael: Museo Internacional de la Gaita: catálogo. Gijón, 1970, p.19.
Veiga de Oliveira, Ernesto: Instrumentos musicais populares portugueses [1966]. Lisboa, 1982 (2), p.326.