The name likely has Celtic roots meaning "fortress" (-ratum) and "silver" or "bright/illuminated" (argento-, Latin roots).

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[–] 2 points 4 days ago* (last edited 3 days ago)

Similarly, Argentina got its name from its originally rich silver mines. I can imagine it's obvious to people who live there, but I only read about it a year or two ago, despite having known the latin name since learning about the periodic table.

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