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From The Collaborative International Dictionary of English v.0.48:
Diatonic \Di`a*ton"ic\ (d[imac]`[.a]*t[o^]n"[i^]k), a. [L. diatonicus, diatonus, Gr. ?, ?, fr. ? to stretch out; dia` through + ? to stretch: cf. F. diatonique. See Tone.] (Mus.) Pertaining to the scale of eight tones, the eighth of which is the octave of the first. [1913 Webster] Diatonic scale (Mus.), a scale consisting of eight sounds with seven intervals, of which two are semitones and five are whole tones; a modern major or minor scale, as distinguished from the chromatic scale. [1913 Webster]