astronautical

The story

1. Proto-Indo-European*h₂eHs-
2. Proto-Indo-European*h₂stḗr
3. Proto-Hellenic*astḗr
4. Ancient Greekἀστήρ (astḗr)
5. Ancient Greekᾰ̓́στρον (ắstron)
6. Englishastro-
7. Proto-Indo-European*(s)neh₂-
8. Proto-Indo-European*néh₂us
9. Ancient Greekναῦς (naûs)
10. Ancient Greekναύτης (naútēs)
11. Englishastronaut
12. Proto-Indo-European*h₂el-
13. Proto-Indo-European*h₂élisder.?
14. English todayastronautical

From astronaut + -ical.