Meaning

noun a machine that smooths or glazes paper or cloth by pressing it between plates or passing it through rollers

verb press between rollers or plates so as to smooth, glaze, or thin into sheets

origin* From Middle French calandre, from Late Latin calendra, altered from Latin cylindrus (“cylinder”), from Ancient Greek κύλινδρος (kúlindros). Doublet of calander and cylinder. * This spelling calender was introduced in the 17th century to differentiate the machine from the chronological senses of calendar.

Etymology from Wiktionary, CC BY-SA 3.0