The word "wrinkles" refers to small lines or folds that appear on the surface of something, typically skin. As people age, their skin may develop wrinkles due to a loss of elasticity and moisture. Wrinkles can also occur in other materials, like fabric, when they become creased or folded.
The word "wrinkle" originates from the Middle English word "wrinkel," which comes from the Old English "wrincle," meaning to twist or turn. The term relates to both the action of causing something to crease and the resulting lines or folds.