flugelhorn

noun

a brass wind instrument with three valves, usually pitched in B flat and used especially in military bands.

noun

a type of valved brass instrument consisting of a tube of conical bore with a cup-shaped mouthpiece, used esp in brass bands. It is a transposing instrument in B flat or C, and has the same range as the cornet in B flat

1854, from German flügelhorn, from flügel “wing” (related to fliegen “to fly;” see fly (v.1)) + horn “horn” (see horn (n.)).