Definition of flugel:
(n) :
(obsolete) A harpsichord.
(n) :
(obsolete) A grand piano.
(n) :
Alternative form of flugelhorn. [A brass instrument resembling a cornet but with a wider, conical bore, and usually with three valves, in the same B-flat pitch as many trumpets and cornets but with a more deeply conical mouthpiece than those. A bugle with valves.]