impervious to light: a lightproof film cartridge.

Origin of lightproof

First recorded in 1920–25; light1 + -proof Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for lightproof

Historical Examples of lightproof

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

    Planet of the Damned

    Harry Harrison