Etymology

rivalrous

ri·val·rous
R1I1V4A1L1R1O1U1S1

Today it means: Having a relationship of rivalry. Full definition →

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

  1. Englishrival
  2. Englishrivalry
  3. Proto-Indo-European*h₃ed-
  4. Proto-Indo-European*h₃édosder.?
  5. English todayrivalrous

From rivalry + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.