lightfast

[ lahyt-fast, -fahst ]
/ ˈlaɪtˌfæst, -ˌfɑst /

adjective

not affected or faded by light, especially sunlight; colorfast when exposed to light.

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THINK YOU’VE GOT A HANDLE ON THIS US STATE NICKNAME QUIZ?

Did you ever collect all those state quarters? Put them to good use on this quiz about curious state monikers and the facts around them.
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Mississippi’s nickname comes from the magnificent trees that grow there. What is it?

Origin of lightfast

First recorded in 1955–60; light1 + fast1

OTHER WORDS FROM lightfast

lightfastness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for lightfast

light-fast

adjective

(of a dye or dyed article) unaffected by light
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012