Etymology

aphthous

A1P3H4T1H4O1U1S1

Today it means: Of, or relating to aphtha. Full definition →

Proto-Indo-European *h₃édosder.? ← English aphtha
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The story

  1. Englishaphtha
  2. Proto-Indo-European*h₃ed-
  3. Proto-Indo-European*h₃édosder.?
  4. English todayaphthous

From aphtha + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.