Monochord
Pronunciation : Mon"o*chord
Part of Speech : n.
Etymology : [L. monochordon, Gr. monocorde. See Chord, and cf. Mainchord.] (Mus.)
Definition : Defn: An instrument for experimenting upon the mathematical relations of musical sounds. It consists of a single string stretched between two bridges, one or both of which are movable, and which stand upon a graduated rule for the purpose of readily changing and measuring the length of the part of the string between them.
Source : Webster's Unabridged Dictionary, 1913