Plural of calender: multiple machines with heavy rollers used to smooth and gloss materials; or third-person singular present tense of the verb calender.
Plural form of calender, or the present-tense third-person singular of the verb, from the noun meaning 'roller machine.'
A modern paper or textile mill might have dozens of calenders working in sequence—each one applying slightly different pressure and temperature to achieve the perfect final product.
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