a bowed stringed instrument chiefly of the 16th and 17th centuries made in treble, alto, tenor, and bass sizes and distinguished from members of the violin family especially in having a deep body, a flat back, sloping shoulders, usually six strings, a fretted fingerboard, and a low-arched bridge
bowed musical instrument, differing from the violin in having deeper ribs, sloping shoulders, a greater number of strings, usually six, and frets: common in the 16th and 17th centuries in various sizes from the treble viol to the bass viol