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lightfast

[lahyt-fast, -fahst] /ˈlaɪtˌfæst, -ˌfɑst/
adjective
1.
not affected or faded by light, especially sunlight; colorfast when exposed to light.
Origin
1955-1960
1955-60; light1 + fast1
Related forms
lightfastness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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