Etymology

anthelmintic

an·thel·min·tic
A1N1T1H4E1L1M3I1N1T1I1C3

Today it means: Destructive to parasitic worms. Full definition →

English helminth ← Ancient Greek ἕλμῐνς (hélmĭns) ← Proto-Indo-European *h₂énti
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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. Englishant-
  8. Ancient Greekἕλμῐνς (hélmĭns)
  9. Englishhelminth
  10. English todayanthelmintic

From ant- + helminth + -ic; for some speakers, the prefix's t- and helminth's initial h- have become /θ/ while the final th of helminth has become t by dissimilation.

Etymology from Wiktionary, CC BY-SA 4.0.