Etymology

flameproof

F4L1A1M3E1P3R1O1O1F4

Today it means: Resistant to catching fire. Full definition →

English proof ← Middle English flawme ← Anglo-Norman flaume
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The story

  1. Proto-Indo-European*bʰel-
  2. Proto-Italic*flagmā
  3. Latinflamma
  4. Old Frenchflame
  5. Anglo-Normanflaume
  6. Middle Englishflawme
  7. Englishflame
  8. Englishproof
  9. English todayflameproof

From flame + -proof.

Etymology from Wiktionary, CC BY-SA 4.0.