Etymology

fireproof

F4I1R1E1P3R1O1O1F4

Today it means: Resistant to damage from fire. Full definition →

English proof ← Middle English fyr ← Old English fȳr
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The story

  1. Proto-Indo-European*péh₂wr̥
  2. Proto-Germanic*fōr
  3. Proto-West Germanic*fuir
  4. Old Englishfȳr
  5. Middle Englishfyr
  6. Englishfire
  7. Englishproof
  8. English todayfireproof

From fire + -proof.

Etymology from Wiktionary, CC BY-SA 4.0.