lightproof
Sealed so that no light can enter.
Adjective
- Sealed so that no light can enter.
- Unexposed photographic film must be kept in a lightproof container or it will be exposed and ruined.
Origin
Etymology tree Proto-Indo-European *lewk-der. Proto-Germanic *leuhtaz Proto-West Germanic *leuht Old English lēoht Middle English light English light English -proof English lightproof From light + -proof.