Search Dictionary
Definition of lightproof

lightproof

/ˈlaɪt.pruːf/
light · proof
Past Simple:lightproofed
•
Past Participle:lightproofed
•
Present Participle:lightproofing
JUMP TO:

lightproof Lexical Profile

lightproof Game Scores & Validity

• adjective

1

Impervious to light; preventing light from entering, passing through, or causing damage.

Example

"Photographic film must be stored in a lightproof container until it has been fully developed."

Synonyms
View all synonyms for lightproof
Antonyms
View all antonyms for lightproof

• verb

1

To seal or treat a room, container, or material so that light cannot penetrate it.

Example

"The technician used heavy black tape and blackout curtains to lightproof the makeshift darkroom."

Synonyms
View all synonyms for lightproof
Antonyms
View all antonyms for lightproof

• Rhymes for lightproof

• Nearby Words

lightly
lightness
lightning
lightproof
lights
lightsaber
lightspeed

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Lightproof. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/lightproof
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWords
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.