Cornet-a-piston
Pronunciation : Cor"net-?-pis`ton (kr"nt--ps"tn; F. kr`n`ps`tn")
Part of Speech : n.;
Etymology : [F.] (Mus.)
Definition : Defn: A brass wind instrument, like the trumpet, furnished with valves moved by small pistons or sliding rods; a cornopean; a cornet.
pl. Cornets-?- piston.
Source : Webster's Unabridged Dictionary, 1913