Calender — a machine that presses paper, cloth, or other material between rollers to smooth, glaze, or thin it — comes via French calandre from Latin cylindrus (roller), from Greek kulindein (to roll), with earliest documented use in 1513. It is the second in a week of words that look like misspellings: a calendar puts dates on sheets, a calender puts pressure on them. The photo is the Iron Duke, a 19th-century rubber calender in Bradford on Avon, UK.