Violone \Vi`o*lo"ne\, n. [It. violone, augment. of viola a viol.
See {Viol}.] (Mus.)
The largest instrument of the bass-viol kind, having strings
tuned an octave below those of the violoncello; the
contrabasso; -- called also {double bass}. [Written also
{violono}.]
[1913 Webster]