etymological

The story

1. Proto-Indo-European*set-?
2. Ancient Greekἐτεός (eteós)der.?
3. Ancient Greekἔτυμος (étumos)
4. Proto-Indo-European*leǵ-
5. Proto-Indo-European*lóǵos
6. Proto-Hellenic*lógos
7. Ancient Greekλόγος (lógos)
8. Ancient Greekἐτῠμόλογος (etŭmólogos)
9. Ancient Greekἐτῠμολογῐ́ᾱ (etŭmologĭ́ā)
10. Latinetymologia
11. Old Frenchethimologie
12. Middle Englishethymologie
13. Englishetymology
14. Proto-Indo-European*h₂el-
15. Proto-Indo-European*h₂élisder.?
16. English todayetymological

From etymology + -ical.