Noun
The Greek major third, which comprehend two major tones (the modern major third contains one major and one minor whole tone).
Source: Webster's dictionaryAlso ditone and semiditone are specific for Pythagorean tuning, while tone and tritone are used generically for all tuning systems. Source: Internet
Interestingly, despite its name, a semiditone (3 semitones, or about 300 cents) can hardly be viewed as half of a ditone (4 semitones, or about 400 cents). Source: Internet
Rarely, the term ditone is also used to indicate an interval spanning two whole tones (for example, a major third ), or more strictly as a synonym of major third. Source: Internet