Luster
/lˈʌstər/
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Definition
(noun) The ability or condition of shining with reflected light; sheen, gleam, gloss, sparkle, shine, etc.
Sentence Examples
This ring lost its luster.
Our cat's fur has lost its luster.
CEFR Practice Quiz
The diamond had a brilliant ____ that caught the light and sparkled beautifully in the sun today.