Preserved or flavored with salt; or figuratively meaning experienced or seasoned (like a 'salted old sailor').
From Old English 'sealte' (salt), combined with the past tense '-ed.' Salt preservation dates back thousands of years and was one of humanity's first food technologies before refrigeration.
Salt was so valuable in ancient times that Roman soldiers were sometimes paid in salt—the word 'salary' actually comes from the Latin 'salarium' (salt ration)—which is why controlling salt supplies controlled empires.
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