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Latin word argentum comes from Proto-Indo-European *h₂erǵ-, and later Proto-Indo-European *h₂r̥ǵn̥tóm (Silver.)
*h₂erǵ- (Proto-Indo-European)
white, to shine
*h₂r̥ǵn̥tóm (Proto-Indo-European)
Silver.
*argentom (Proto-Italic)
Silver.
argentum (Latin)
(by extension) a silver thing. Silver (metal, element).