Etymology

isoantigen

I1S1O1A1N1T1I1G2E1N1

Today it means: an immunologically active material (especially a protein or polysaccharide) that is present only in some individuals of a particular species; responsible for the formation of antibodies Full definition →

English antigen ← French antigène ← Ancient Greek ἀντι- (anti-)
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The story

  1. Ancient Greekῐ̓́σος (ĭ́sos)
  2. Englishiso-
  3. Proto-Indo-European*h₂ent-
  4. Proto-Indo-European*h₂énts
  5. Proto-Indo-European*h₂énti
  6. Ancient Greekᾰ̓ντῐ́ (ăntĭ́)
  7. Ancient Greekἀντι- (anti-)
  8. Frenchanti-
  9. Frenchgène
  10. Frenchantigène
  11. Englishantigen
  12. English todayisoantigen

From iso- + antigen.

Etymology from Wiktionary, CC BY-SA 4.0.