adjective
a term used to describe something that is designed to prevent light from passing through
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The lightproof container was designed to protect the sensitive materials from exposure to light.
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Make sure you store the film in a lightproof bag to prevent it from getting ruined.
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I always keep my weed in a lightproof jar to keep it fresh.
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His heart was like a lightproof vault, guarding his deepest emotions from the outside world.