Etymology

crossreactive

C3R1O1S1S1R1E1A1C3T1I1V4E1

Today it means: Describing a reaction between an antigen and an antibody that was formed to counteract a different (often similar) antigen Full definition →

English reactive ← Middle English acte ← Old French act
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The story

  1. Proto-Indo-European*(s)ker-der.?
  2. Proto-Italic*kruks /*krukis
  3. Latincrux
  4. Old Irishcros
  5. Old Norsekross
  6. Old Englishcros
  7. Middle Englishcross
  8. Middle Englishcros-
  9. Englishcross-
  10. Proto-Italic*wre-
  11. Latinre-
  12. Old Frenchre-
  13. Middle Englishre-
  14. Englishre-
  15. Proto-Indo-European*h₂eǵ-
  16. Proto-Indo-European*h₂éǵeti
  17. Proto-Italic*agō
  18. Latinagō
  19. Latināctus
  20. Latinācta
  21. Old Frenchact
  22. Middle Englishacte
  23. Englishact
  24. Englishreact
  25. Englishreactive
  26. English todaycrossreactive

From cross- + reactive.

Etymology from Wiktionary, CC BY-SA 4.0.