lightproof
adjective
light·proof ˈlīt-ˌprüf 
: impenetrable by light
Word History
First Known Use
circa 1788, in the meaning defined above
lightproof
adjective
as in soundproof
Synonyms & Similar Words
Relevance
- soundproof
- waterproof
- airtight
- watertight
- leakproof
- hermetic
- hermetical
- compact
- impermeable
- dense
- snug
- thick
- impenetrable
- impervious
- close
- tight
Antonyms & Near Antonyms
- permeable
- porous
- penetrable
- pervious
- leaky
- absorbent
- unsealed