barometric

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*med-
8. Proto-Indo-European*meh₁-
9. Ancient Greekμέτρον (métron)
10. Ancient Greekμετρῐκός (metrĭkós)
11. Ancient Greekμέτρον (métron)
12. Latinmetrum
13. Latinmetricus
14. English todaybarometric

From baro- + -metric.