Definition of lightfast adjective from the Oxford Advanced Learner's Dictionary

 

lightfast

 adjective
adjective
BrE BrE//ˈlaɪtfɑːst//
 
; NAmE NAmE//ˈlaɪtfæst//
 
(specialist)
 
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(of paint used for art) not losing its colour in light
See the Oxford Advanced American Dictionary entry: lightfast