tetrachordal en · ADJ
Etymology
From tetrachord + -al.
Meanings
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(not-comparable) Relating to a tetrachord.
The tune is Hypo-Phrygian, which resembles the Prophetic mode; the melodic line has a tetrachordal curve and consists of four bar periods with a coda of two bars.
1929, Abraham Zevi Idelsohn, Jewish Music: Its Historical Development, page 376: