Muselar (gender unknown)
(with) definite article: deIn »A history of the harpsichord«, vol.1 (2003), Edward L. Kottick mentions that John Koster in his »Keyboard musical instruments in the Museum of Fine Arts, Boston« (1994, p.35) notes that Muselar was a Flemish term for a bagpipe, referring to De Hen.
De Hen, Ferd. J.: Folk instruments of Belgium (II). In: The Galpin Society Jl. XXVI (May 1973), p.108.