stereodiagram

The story

1. Proto-Indo-European*ster-
2. Ancient Greekστερεός (stereós)
3. Ancient Greekστερεο- (stereo-)
4. Englishstereo-
5. Proto-Indo-European*dwóh₁
6. Proto-Indo-European*trísinflu.
7. Proto-Indo-European*dwís
8. Ancient Greekδιά (diá)
9. Ancient Greekδῐᾰ- (dĭă-)
10. Proto-Indo-European*gerbʰ-
11. Proto-Hellenic*grə́pʰō
12. Ancient Greekγρᾰ́φω (grắphō)
13. Ancient Greekγρᾰ́μμᾰ (grắmmă)
14. Ancient Greekδιάγραμμα (diágramma)
15. Italiandiagramma
16. Frenchdiagramme
17. Englishdiagram
18. English todaystereodiagram

From stereo- + diagram.