leucoagglutination

The story

1. Proto-Indo-European*lewk-
2. Proto-Indo-European*lewkós
3. Proto-Hellenic*leukós
4. Ancient Greekλευκός (leukós)
5. Englishleuco-
6. Frenchagglutination
7. Proto-Indo-European*h₂éd
8. Proto-Italic*ad
9. Proto-Italic*ad-
10. Latinad-
11. Proto-Indo-European*gleyH-
12. Proto-Indo-European*glóh₁ytn̥
13. Proto-Italic*gloiten
14. Latinglūten
15. Latinglūtinō
16. Latinagglūtinō
17. New Latinagglutinatio
18. Englishagglutination
19. English todayleucoagglutination

From leuco- + agglutination.