Dictionary

lightfast

lightfast

adjective light·fast \-ˌfast\

Definition of LIGHTFAST

:  resistant to light and especially to sunlight; especially :  colorfast to light
light·fast·ness \-ˌfas(t)-nəs\ noun

First Known Use of LIGHTFAST

1950

Browse

Next Word in the Dictionary: light field artilleryPrevious Word in the Dictionary: lightfaceAll Words Near: lightfast
March 05, 2015
ilk Hear it
Sort or kind
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears