Etymology

lightproof

L1I1G2H4T1P3R1O1O1F4

Today it means: Sealed so that no light can enter. Full definition →

English light ← Middle English light ← Old English lēoht
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The story

  1. Proto-Germanic*leuhtą
  2. Proto-West Germanic*leuht
  3. Old Englishlēoht
  4. Middle Englishlight
  5. Englishlight
  6. English todaylightproof

From light + -proof.

Etymology from Wiktionary, CC BY-SA 4.0.