superdiagram

The story

1. Proto-Indo-European*úp
2. Proto-Indo-European*upér
3. Proto-Italic*super
4. Latinsuper
5. Latinsuper-
6. Englishsuper-
7. Proto-Indo-European*dwóh₁
8. Proto-Indo-European*trísinflu.
9. Proto-Indo-European*dwís
10. Ancient Greekδιά (diá)
11. Ancient Greekδῐᾰ- (dĭă-)
12. Proto-Indo-European*gerbʰ-
13. Proto-Hellenic*grə́pʰō
14. Ancient Greekγρᾰ́φω (grắphō)
15. Ancient Greekγρᾰ́μμᾰ (grắmmă)
16. Ancient Greekδιάγραμμα (diágramma)
17. Italiandiagramma
18. Frenchdiagramme
19. Englishdiagram
20. English todaysuperdiagram

From super- + diagram.