helideck

The story

1. Proto-Indo-European*welH-
2. Ancient Greekἕλιξ (hélix)
3. Proto-Indo-European*peth₂-
4. Proto-Indo-European*péth₂r̥
5. Proto-Hellenic*pterón
6. Ancient Greekπτερόν (pterón)
7. Frenchhélicoptère
8. Englishhelicopterclip.
9. Englishheli-
10. Proto-Indo-European*(s)teg-
11. Proto-Germanic*þaką
12. Proto-Germanic*þakjaną
13. Proto-West Germanic*þakkjan
14. Old Dutchthecken
15. Middle Dutchdeckendeverb.
16. Middle Dutchdec
17. Middle Englishdekke
18. Englishdeck
19. English todayhelideck

From heli- + deck.