nanodiamond

The story

1. Ancient Greekνᾶνος (nânos)
2. Latinnānus
3. Englishnano-
4. Proto-Indo-European*né
5. Proto-Indo-European*n̥-
6. Proto-Hellenic*ə-
7. Ancient Greekἀ- (a-)?
8. Proto-Indo-European*demh₂-
9. Ancient Greekδαμνάω (damnáō)?
10. Ancient Greekἀδάμας (adámas)
11. Latinadamās
12. Late Latindiamās
13. Old Frenchdiamant
14. Middle Englishdyamaunt
15. Englishdiamond
16. English todaynanodiamond

From nano- + diamond.