The Collaborative International Dictionary of English v.0.48:

Seraphine \Ser"a*phine\, n. [From Seraph.] (Mus.)
   A wind instrument whose sounding parts are reeds, consisting
   of a thin tongue of brass playing freely through a slot in a
   plate. It has a case, like a piano, and is played by means of
   a similar keybord, the bellows being worked by the foot. The
   melodeon is a portable variety of this instrument.
   [1913 Webster]