diatonic (adj.)youdaoicibaDictYouDict[diatonic 词源字典]
c. 1600, from French diatonique, from Latin diatonicus, from Greek diatonikos, from diatonos "extending; pertaining to the diatonic scale," from dia- (see dia-) + teinein "to stretch" (see tenet).[diatonic etymology, diatonic origin, 英语词源]