lightproof

adjective
light·​proof | \ ˈlīt-ˌprüf How to pronounce lightproof (audio) \

Definition of lightproof

: impenetrable by light

First Known Use of lightproof

circa 1788, in the meaning defined above

Learn More About lightproof

Time Traveler for lightproof

Time Traveler

The first known use of lightproof was circa 1788

See more words from the same year

Dictionary Entries Near lightproof

light pressure

lightproof

light quantum

See More Nearby Entries 

Statistics for lightproof

Last Updated

23 Aug 2022

Cite this Entry

“Lightproof.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lightproof. Accessed 5 Oct. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on lightproof

Thesaurus: All synonyms and antonyms for lightproof

Nglish: Translation of lightproof for Spanish Speakers

WORD OF THE DAY

Test Your Vocabulary

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!