A bun is a small, round bread roll, often soft and slightly sweet. You might eat a hamburger on a bun, or have a hot dog nestled in a long bun. Cinnamon buns are sweet rolls glazed with icing, perfect for breakfast or dessert.

The word also refers to a hairstyle where hair is gathered and twisted into a round shape at the back or top of the head. Ballet dancers often wear their hair in tight buns so it stays out of the way during performances. You might pull your hair into a messy bun on a hot day, or style it into an elegant bun for a fancy occasion. The hairstyle gets its name because the gathered hair can look like a round bread bun sitting on your head.