photographical

The story

1. Proto-Indo-European*bʰeh₂-
2. Proto-Indo-European*bʰéh₂os
3. Proto-Hellenic*pʰáwos
4. Ancient Greekφᾰ́ος (phắos)
5. Ancient Greekφῶς (phôs)
6. Ancient Greekφωτο- (phōto-)
7. Englishphoto-
8. Proto-Indo-European*gerbʰ-
9. Proto-Hellenic*grə́pʰō
10. Ancient Greekγρᾰ́φω (grắphō)
11. Ancient Greekγραφή (graphḗ)
12. Englishphoto-
13. Ancient Greekγράφω (gráphō)
14. Englishphotograph
15. Englishphotographic
16. Proto-Indo-European*h₂el-
17. Proto-Indo-European*h₂élisder.?
18. English todayphotographical

From photographic + -al.