Violoncello :: Violoncello (n.) A stringed instrument of music; a bass viol of four strings, or a bass violin with long, large strings, giving sounds an octave lower than the viola, or tenor or alto violin..
Violone :: Violone (n.) The largest instrument of the bass-viol kind, having strings tuned an octave below those of the violoncello; the contrabasso; -- called also double bass..