diatonic

diatonic
[ˌdʌɪəˈtɒnɪk]
adjective
  1. (Music)(of a scale, interval, etc.) involving only notes proper to the prevailing key without chromatic alteration
    (乐)(音阶、音程等)自然音阶的
    ■(of a melody or harmony) constructed from such a scale
    (音调,和声)自然音阶的
语源
  1. early 17th cent. (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'
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