lightfast

[ lahyt-fast, -fahst ]

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

Origin of lightfast

1
First recorded in 1955–60; light1 + fast1

Other words from lightfast

  • lightfastness, noun

Words Nearby lightfast

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use lightfast in a sentence

  • Ironically, the red paint made decades ago was relatively lightfast, because the color came from iron oxide, which keeps its color in the sun just as red, iron-rich soil found in some parts of the country does.

British Dictionary definitions for light-fast

light-fast

adjective
  1. (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