Silver, especially as used in heraldry to denote the color white or silver in coats of arms.
From Old French 'argent', from Latin 'argentum' (silver). The heraldic usage preserved the term in English even as 'silver' became the common word for the metal.
This word survived in English primarily through the formal language of heraldry, where precision matters - 'argent' sounds more dignified on a coat of arms than plain old 'silver' ever could.
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