Etymology

air-proof

Today it means: airtight Full definition →

English air ← Middle English aire ← Old French air
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The story

  1. Latināēr
  2. Old Frenchair
  3. Middle Englishaire
  4. Englishair
  5. English todayair-proof

From air + -proof.

Etymology from Wiktionary, CC BY-SA 4.0.