halophosphine

The story

1. Proto-Indo-European*sḗh₂l
2. Proto-Hellenic*hā́ls
3. Ancient Greekᾰ̔́λς (hắls)
4. Englishhalo-
5. Proto-Indo-European*bʰeh₂-
6. Proto-Indo-European*bʰéh₂os
7. Proto-Hellenic*pʰáwos
8. Ancient Greekφᾰ́ος (phắos)
9. Ancient Greekφῶς (phôs)
10. Ancient Greekφωσφόρος (phōsphóros)
11. Latinphōsphorus
12. Englishphosphorusclip.
13. Englishphosph-
14. Englishphosphine
15. English todayhalophosphine

From halo- + phosphine.