GNU Collaborative International Dictionary of English

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1.       
   Monochord , n. [L. monochordon, Gr. , fr.  with but one string;  only, single +  string: cf. F. monocorde. See Chord, and cf. Mainchord.] (Mus.) 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.
   1913 Webster