lightfast

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

adjective

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

Origin of lightfast

First recorded in 1955–60; light1 + fast1

OTHER WORDS FROM lightfast

light·fast·ness, noun

Words nearby lightfast

lighter than air, lighter-than-air, lighterage, lighterman, lightface, lightfast, lightfoot, lightheaded, lighthearted, lighthouse, lighthouse clock

British Dictionary definitions for light-fast

light-fast

adjective

(of a dye or dyed article) unaffected by light