lightproof

L1I1G2H4T1P3R1O1O1F4

adjective

Sealed so that no light can enter.

“Unexposed photographic film must be kept in a lightproof container or it will be exposed and ruined.”

Similar
light-tightopaque
OriginEnglish light ← Middle English light ← Old English lēoht →
Scrabble 19
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Meanings

adjectivelightproof (comparative more lightproof, superlative most lightproof)

comparative more lightproof · superlative most lightproof

  1. Sealed so that no light can enter.

    Unexposed photographic film must be kept in a lightproof container or it will be exposed and ruined.

Synonyms & antonyms

adjectivenot penetrable by light

Similar
light-tightopaque
Also see
light-tight

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

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

From light + -proof.

Full word history & related roots →

Translations

Bulgarian непрозра́чен
  • непрозра́чен (neprozráčen)sealed so that no light can enter
Irish solasdíonach
  • solasdíonachsealed so that no light can enter
Polish światłoszczelny
  • światłoszczelnysealed so that no light can enter
Cite this entry
APA

lightproof. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/lightproof

MLA

“lightproof.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/lightproof. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “lightproof,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/lightproof.

Source: lightproof on Wiktionary, CC BY-SA 4.0.