monochord

mono·chord

noun \ˈmä-nə-ˌkȯrd\

Definition of MONOCHORD

: an instrument of ancient origin for measuring 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

Origin of MONOCHORD

Middle English monocorde, from Middle French, from Medieval Latin monochordum, from Greek monochordon, from mon- + chordē string — more at yarn

First Known Use: 15th century