Etymology

acid-free

Today it means: Alkaline or neutral; not acidic. Full definition →

Old English frēo ← Proto-West Germanic *friu ← Proto-Germanic *frijwaz
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The story

  1. Latinacidu
  2. Frenchacide
  3. Englishacid
  4. Proto-Indo-European*preyH-
  5. Proto-Indo-European*priHós
  6. Proto-Germanic*frijwaz
  7. Proto-West Germanic*friu
  8. Old Englishfrēo
  9. English todayacid-free

From acid + -free.

Etymology from Wiktionary, CC BY-SA 4.0.