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Adjective: lightproof  lIt-proof
  1. Not penetrable by light
    "lightproof containers"
    - light-tight

See also: opaque

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light-mindedness
lightness
lightning
lightning arrester
lightning bug
lightning conductor
Lightning Hurler
lightning rod
light-of-love
light-o'-love
lightproof
light-sensitive
lightship
light-skinned
lightsome
lightsomely
lightsomeness
lights-out
light-tight
lightweight
lightwood