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diatonic

Pronunciation: /ˌdʌɪəˈtɒnɪk/

Definition of diatonic

adjective

Music

(of a scale, interval, etc.) involving only notes proper to the prevailing key without chromatic alteration.
(of a melody or harmony) constructed from a diatonic scale.

Origin:

early 17th century (denoting a tetrachord divided into two tones and a lower semitone, or ancient Greek music based on this): from French diatonique, or via late Latin from Greek diatonikos 'at intervals of a tone', from dia 'through' + tonos 'tone'