Jisho

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Noun
1. brilliance; polish; lustre; luster; glossy finish (of photographs)
Wikipedia definition
2. Lustre (mineralogy)Lustre (or luster) is a description of the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance. A range of terms are used to describe lustre. Many terms refer to materials having similar lustres, such as earthy, metallic, greasy, and silky. Similarly, the term vitreous (derived from the Latin for glass, vitrum) refers to a glassy lustre.
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