Bass vi·ol Mus. A stringed instrument of the viol family, used for playing bass. See 3d Bass, n., and Violoncello.
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  bass viol
       n 1: viol that is the bass member of the viol family with
            approximately the range of the cello [syn: viola da
            gamba]
       2: largest and lowest member of the violin family [syn: bass
          fiddle, bull fiddle, double bass, contrabass, string
          bass]