Etymology

rainproof

R1A1I1N1P3R1O1O1F4

Today it means: waterproof (for use outdoors); resistant to rain Full definition →

English proof ← Middle English reyn ← Old English reġn
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The story

  1. Proto-Indo-European*Hréǵʰ-
  2. Proto-Indo-European*Hréǵʰnos?
  3. Proto-Germanic*regną
  4. Proto-West Germanic*regn
  5. Old Englishreġn
  6. Middle Englishreyn
  7. Englishrain
  8. Englishproof
  9. English todayrainproof

From rain + -proof.

Etymology from Wiktionary, CC BY-SA 4.0.