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Tetrachordon

τετράχορδον). A word meaning literally “four-stringed,” and hence “having four notes.” A scale comprising two tones and a half, which formed the old Greek musical system. The word does not mean any special instrument of music. Vitruvius applies the term to a waterorgan (hydraulus) when it had only four barrels (x. 8, 2). See Hydraulus.

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