Webster's English Dictionary

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diatonic

dia.ton.ic \.di--*-'ta:n-ik\ \-'ta:n-i-k(*-)le-\ aj [LL diatonicus, fr. Gk 
   diatonikos, fr. diatonos stretching, f]r. diateinein to stretch out, fr. 
   dia- + teinein to stretch - more at THIN : relating to a standard major or 
   minor scale of eight tones to the octav e without chromatic deviation - 
   dia.ton.i.cal.ly av