τετράχορδος
From LSJ
κακοὶ μάρτυρες ἀνθρώποισιν ὀφθαλμοὶ καὶ ὦτα βαρβάρους ψυχὰς ἐχόντων → eyes and ears are poor witnesses for men if their souls do not understand the language (Heraclitus Phil.: Fr. B 107; Testimonia: Fragment 16, line 6)
English (LSJ)
ον, (χορδή)
A four-stringed, ὄργανον Ath.4.183a; λύρα Str.13.2.4. II Subst. -χορδον, τό, tetrachord, i.e. scale of four notes, comprising two tones and a half, Arist.Pr.922b8, Fr.47, Plu.2.1021e, etc.: metaph., (sc. παθῶν) Aristo Stoic.1.85, cf. Jul.Caes.315c.
German (Pape)
[Seite 1100] viersaitig; τὸ τετράχορδον, das Tetrachord, Arist. probl. 19, 33 u. Music., eine Folge von vier Saiten od. Tönen, die drittehalb Töne maßen, die Grundlage aller spätern Tonsysteme.
