pyknon, pyknoma

(Greek: "condensation", plurals: pykna, pyknomata)

Intervallically dense region of non-diatonic, i.e., chromatic or enharmonic, genera.

The width of the pyknon is less than or equal to 1/2 of the Fourth.

[from John Chalmers, Divisions of the Tetrachord]

That is, the widest possible pyknon has an irrational proportion of
(4/3)^(1/2), or sqrt(4/3). [-Monzo]

see also my Tutorial on ancient Greek tetrachord-theory, and my paper on Aristoxenus.

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