What is "ditone"

Ditone \Di"tone`\, n. [Gr. ? of two tones; di- = di`s- twice + ? tone.] (Mus.) The Greek major third, which comprehend two major tones (the modern major third contains one major and one minor whole tone).

n. (context obsolete music English) An interval of two tones

In music, a ditone (, from , "of two tones") is the interval of a major third. The size of a ditone varies according to the sizes of the two tones of which it is compounded. The largest is the Pythagorean ditone, with a ratio of 81:64, also called a comma-redundant major third; the smallest is the interval with a ratio of 100:81, also called a comma-deficient major third.