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1. Oxford Dictionary

   lightfast

   • IPA[ˈlʌɪtfɑːst]

   英式

   • adj.
     (of a dye or pigment) not prone to discolour when exposed to light
2. • 釋義

   adj.

   形容詞

   • 1. (of a dye or pigment) not prone to discolour when exposed to light colour it with a lightfast paint