gly-

The story

1. Proto-Indo-European*h₂ent-
2. Proto-Indo-European*h₂énts
3. Proto-Indo-European*h₂énti
4. Ancient Greekᾰ̓ντῐ́ (ăntĭ́)
5. Ancient Greekἀντι- (anti-)
6. Englishanti-
7. Proto-Indo-European*úp
8. Proto-Indo-European*upér
9. Proto-Hellenic*hupér
10. Ancient Greekῠ̔πέρ (hŭpér)
11. Ancient Greekῠ̔περ- (hŭper-)
12. Englishhyper-
13. Proto-Hellenic*dlukús
14. Ancient Greekγλῠκῠ́ς (glŭkŭ́s)
15. Englishglyc-
16. Ancient Greekαἷμᾰ (haîmă)
17. Englishglycemia
18. Englishhyperglycemia
19. Englishhyperglycemic
20. Englishantihyperglycemic
21. English todaygly-

Contraction of antihyperglycemic.