anticountermeasure

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*ḱe?
8. Proto-Indo-European*ḱóm
9. Proto-Italic*kom
10. Proto-Italic*kom-
11. Proto-Italic*komteros
12. Proto-Italic*komterād
13. Latincontrā
14. Old Frenchcontre-
15. Anglo-Normancountre-
16. Middle Englishcounter-
17. Englishcounter-
18. Proto-Indo-European*med-
19. Proto-Indo-European*meh₁-
20. Proto-Italic*mētis
21. Latinmētior
22. Latinmēnsūra
23. Old Frenchmesure
24. Middle Englishmesure
25. Englishmeasure
26. Englishcountermeasure
27. English todayanticountermeasure

From anti- + countermeasure.