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tone[tone 词源字典]

tone: [14] English acquired tone via Old French ton and Latin tonus from Greek tónos ‘stretching, tension’, hence ‘sound’. This in turn went back to the Indo-European base *ton-, *ten- ‘stretch’, which also produced English tend, tense, thin, etc. The semantic transference from ‘tension’ to ‘sound’ may have arisen from the notion of tightening the strings of a musical instrument, but it could also be due to association with another Indo-European base *ton-, meaning ‘resound’ (source of English thunder). The derivative tonic [17] comes ultimately from Greek tonikós. Tune is an unexplained variant of tone.
=> tend, tense, tenuous, thin, tune[tone etymology, tone origin, 英语词源]