autoradiogram

The story

1. Proto-Indo-European*h₂ew
2. Proto-Indo-European*tó-
3. Proto-Hellenic*autós
4. Proto-Indo-European*h₂ew
5. Ancient Greekαὖ (aû)
6. Ancient Greekτόν (tón)
7. Ancient Greekαὐτός (autós)
8. Ancient Greekαὐτο- (auto-)
9. Englishauto-
10. Latinradius
11. Englishradio-
12. Proto-Indo-European*gerbʰ-
13. Proto-Hellenic*grə́pʰō
14. Ancient Greekγρᾰ́φω (grắphō)
15. Ancient Greekγράμμα (grámma)
16. English todayautoradiogram

From auto- + radio- + -gram.