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From The Collaborative International Dictionary of English v.0.48:
Violoncello \Vi`o*lon*cel"lo\ (?; 277), n. [It. violoncello, dim. of violone a bass viol. See Violone.] (Mus.) 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. [1913 Webster]