The Collaborative International Dictionary of English v.0.48:

Flugel \Fl["u]"gel\, n. [G., a wing.] (Mus.)
   1. A grand piano or a harpsichord, both being wing-shaped.
      [archaic]
      [1913 Webster +PJC]

   2. A flugelhorn.
      [PJC] flugelhorn