Berenpijp (f)
(with) definite article: deIn Verschuere Reynvaan described as "an organ-stop, or [also] a kind of bagpipe, that is usually seen [played] with such an animal [i.e. a bear; ws] at fairs".
Boone, Hubert: De doedelzak. Woord vooraf door J. Van Haver en A. Doppagne… Inleiding door R. De Maeyer… Brussel, 1983, p.23, 94 (note 81: »Verschuere Reynvaan).