MONOCHORD

[mono.chord] n [ME monocorde, fr. MF, fr. ML monochordum, fr. Gk monochordon, fr. mon- + chorde string--more at yarn] (15c): an instrument of ancient origin for meas uring and demonstrating the mathematical relations of musical tones and that consists of a single string stretched over a sound box and a movable bridge set on a graduated scale