ethnoarchaeological

The story

1. Proto-Indo-European*swé
2. Proto-Indo-European*dʰeh₁-
3. Proto-Indo-European*swe-dʰh₁-
4. Proto-Hellenic*séswōtʰa
5. Ancient Greekἔθω (éthō)
6. Ancient Greekἔθνος (éthnos)
7. Englishethno-
8. Proto-Indo-European*h₂er-der.?
9. Proto-Indo-European*h₂ergʰ-der.?
10. Ancient Greekἄρχω (árkhō)
11. Ancient Greekἀρχή (arkhḗ)
12. Ancient Greekἀρχαῖος (arkhaîos)
13. Proto-Indo-European*leǵ-
14. Proto-Indo-European*lóǵos
15. Proto-Hellenic*lógos
16. Ancient Greekλόγος (lógos)
17. Ancient Greekἀρχαιολογίᾱ (arkhaiologíā)
18. Englisharchaeology
19. Proto-Indo-European*h₂el-
20. Proto-Indo-European*h₂élisder.?
21. Englisharchaeological
22. English todayethnoarchaeological

From ethno- + archaeological.