realtone

The story

1. Proto-Indo-European*(H)reh₁-
2. Proto-Indo-European*(H)reh₁ís
3. Proto-Italic*reis
4. Classical Latinrēs
5. Proto-Indo-European*h₂el-
6. Proto-Indo-European*h₂élisder.?
7. Late Latinreālis
8. Old Frenchree
9. Middle Englishreal
10. Englishreal
11. Proto-Indo-European*ten-
12. Proto-Indo-European*tónos
13. Proto-Hellenic*tónos
14. Ancient Greekτόνος (tónos)
15. Latintonus
16. Middle Englishtone
17. Englishtone
18. English todayrealtone

From real + tone.