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