macroagglutination

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. Frenchagglutination
8. Proto-Indo-European*h₂éd
9. Proto-Italic*ad
10. Proto-Italic*ad-
11. Latinad-
12. Proto-Indo-European*gleyH-
13. Proto-Indo-European*glóh₁ytn̥
14. Proto-Italic*gloiten
15. Latinglūten
16. Latinglūtinō
17. Latinagglūtinō
18. New Latinagglutinatio
19. Englishagglutination
20. English todaymacroagglutination

From macro- + agglutination.