Past tense of calender: to press through rollers to smooth and gloss; or as an adjective, describing material that has been processed through a calender.
Past participle of the verb calender, from the noun/machine of the same name, which ultimately traces to Latin cylindrus.
When you run your hand over smooth, glossy paper, you're feeling the result of calendering—a 500-year-old industrial process that's still used to make everyday materials beautiful.
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