baroscope

The story

1. Proto-Indo-European*gʷreh₂-
2. Proto-Indo-European*gʷréh₂us
3. Proto-Hellenic*gʷarus
4. Ancient Greekβαρύς (barús)
5. Ancient Greekβᾰ́ρος (bắros)
6. Englishbaro-
7. Proto-Indo-European*speḱ-
8. Proto-Indo-European*spéḱyeti
9. Proto-Hellenic*sképt͏̌omai
10. Ancient Greekσκέπτομαι (sképtomai)
11. Ancient Greekσκοπός (skopós)
12. Ancient Greekσκοπέω (skopéō)
13. English todaybaroscope

From baro- + -scope.