Definition of sunfast in English:

sunfast

Line breaks: sun|fast
Pronunciation: /ˈsʌnfɑːst
 
/

adjective

US
(Of a dye or fabric) not prone to fade in sunlight.

Definition of sunfast in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal