lightproof

[lahyt-proof]

adjective

impervious to light: a lightproof film cartridge.

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 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