PENTACHORD

pentachord. Pentachord, [ch as k] n. an instrument having five string

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Pen″ta‐chord (?), n. [[L. pentachordus five-stringed, Gr. πεντάχορδοσ; πεντα- five + χορδή string.]] 1. 1. An ancient instrument of music with five strings.
2. 2. An order or system of five sounds. Busby.