Latin word tonus comes from Proto-Indo-European *tengʰ-, Proto-Indo-European - -os, and later Proto-Hellenic *téňňō (To stretch.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *tengʰ- | Proto-Indo-European (ine-pro) | |
| - -os | Proto-Indo-European (ine-pro) | |
| *téňňō | Proto-Hellenic (grk-pro) | To stretch. |
| *tónos | Proto-Indo-European (ine-pro) | Chord, fiber, string. Something stretched. |
| τείνω | Ancient Greek (grc) | |
| *tónos | Proto-Hellenic (grk-pro) | |
| τόνος | Ancient Greek (grc) | |
| tonus | Latin (lat) | (by extension) A strain; tension.. (figuratively) A crack of thunder.. (figuratively) The pitch, sound or tone of something.. The stretching or straining of a rope. |