macrocycle

The story

1. Proto-Indo-European*meh₂ḱ-
2. Proto-Indo-European*mh₂ḱrós
3. Proto-Hellenic*makrós
4. Ancient Greekμᾰκρός (măkrós)
5. Frenchmacro-
6. Englishmacro-
7. Proto-Indo-European*kʷelh₁-redup.
8. Proto-Indo-European*kʷékʷlos
9. Proto-Hellenic*kʷókʷlos
10. Proto-Hellenic*kúklos
11. Ancient Greekκύκλος (kúklos)
12. Late Latincyclus
13. Middle Englishcicle
14. Englishcycle
15. English todaymacrocycle

From macro- + cycle.