三さん全ぜん音おん

noun

tritone

A musical interval spanning three whole tones (augmented fourth or diminished fifth). Used in music theory and composition.

• 三さん全ぜん音おんは中ちゅう世せいでは「悪あく魔まの音おん程てい」と呼よばれていた。

  The tritone was called the 'devil's interval' in the Middle Ages.