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Webster 1913 Edition

Noun.

[Gr. [GREEK] with eight strings;

ὀκτα-

(for

ὀκτώ

eight) + [GREEK] string, chord: cf. F.

octacorde

(Mus.)

An instrument of eight strings; a system of eight tones.

[Also written

octochord

Noun.

an instrument or system of eight sounds.

octachord ‎(plural octachords)