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lightproof

[lahyt-proof]
adjective
  1. impervious to light: a lightproof film cartridge.
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Origin of lightproof

First recorded in 1920–25; light1 + -proof
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for lightproof

Historical Examples

  • This incredible blackness made a lightproof wall for the recessed hollow at the foot of the cliff.

    Planet of the Damned

    Harry Harrison