lightproof.
Sealed so that no light can enter.
Meaning & usage
Sealed so that no light can enter.
Unexposed photographic film must be kept in a lightproof container or it will be exposed and ruined.
Where this word comes from
From light + -proof.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.