Argentina
来自Big Physics
wiktionary
From Latin argentum(“silver”) + the feminine of the adjectival suffix -īnus; in reference to the Río de la Plata ("silver river").
etymonline
Argentina
South American nation, from Latin argentinus "of silver," from PIE root *arg- "to shine; white," hence "silver" as the shining or white metal. It is a Latinized form of (Rio) de la Plata "Silver River," from Spanish plata "silver" (see plate (n.)).