lightproof

[ lahyt-proof ]
/ ˈlaɪtˌpruf /

adjective

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. 2020

Example sentences from the Web for lightproof

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

    Planet of the Damned|Harry Harrison