Etymology

-acious

Today it means: Used to form adjectives from nouns and verb stems. Full definition →

Proto-Indo-European *h₃édosder.?
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The story

  1. Proto-Indo-European*h₃ed-
  2. Proto-Indo-European*h₃édosder.?
  3. English today-acious

From (1) -aci(ty) + -ous and (2) from Old French -acieux, both ultimately from Latin -ācitās.

Etymology from Wiktionary, CC BY-SA 4.0.