Etymology

rustproof

R1U1S1T1P3R1O1O1F4

Today it means: Resistant to rust, oxidation and corrosion. Full definition →

English proof
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The story

  1. Englishrust
  2. Englishproof
  3. English todayrustproof

From rust + -proof.

Etymology from Wiktionary, CC BY-SA 4.0.