bun

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A small bread roll, often sweetened or spiced and sometimes containing dried fruit.
2. n. A tight roll of hair worn at the back of the head.
3. n. Slang A drunken spree.
4. n. Slang One of the buttocks. Often used in the plural.

Century Dictionary and Cyclopedia

1. n. A slightly sweetened and flavored roll or biscuit; a sweet kind of bread baked in small cakes, generally round.
2. n. A dry stalk; the dry stalk of hemp stripped of its rind.
3. n. The tail of a hare.
4. n. A rabbit. Also called bunny.
5. n. A flat-bottomed boat square at both ends.

Wiktionary

1. n. A small bread roll, often sweetened or spiced.
2. n. A tight roll of hair worn at the back of the head.
3. n. A drunken spree.
4. n. A newbie.
5. adj. good (positive)

GNU Webster's 1913

1. n. any of a variety of slightly sweetened or plain raised cakes or bisquits, often having a glazing of sugar and milk on the top crust.
2. n. a type of coiffure in which the hair is gathered into a coil or knot at the top of the head.
3. n. the buttocks.
4. n. same as blood urea nitrogen; the concentration of nitrogen in blood present in the form of urea; -- used as a measure of kidney function.

WordNet 3.0

1. n. small rounded bread either plain or sweet