demitone
/dɪˈmɪtoʊn/Definitions
1. noun
The second-slowest interval in a scale, being the distance between two adjacent scale notes in a semitone.
“The jazz musician carefully calculated the demitone to create a unique melody.”
2. verb
To reduce or alter something by a demitone.
“The musician chose to demitone the notes in the song to create a more melancholic atmosphere.”