Bellows (plurale tantum)
mechanical device used to supply the bag with air
Introduced 18th century; With an outlet tube for the insertion of the blowpipe; NB (plurale tantum): The term is also used when referring to 1 specimen only.
Garvin, Wilbert: The Irish bagpipes: their construction and maintenance [Belfast 1978, Blackstaff Press]. Foreword by Breandán Breathnach. Kells, 1988 (2), p.2.
Habenicht, Gottfried: Der Egerländer Dudelsack. In: Jb. f. ostdeutsche Volkskunde 20 (Marburg, 1977), p.216 + note 25.