Definitions of brown:

• noun:   an orange of low brightness and saturation
• noun:   abolitionist who was hanged after leading an unsuccessful raid at Harper's Ferry, Virginia (1800-1858)
• noun:   Scottish botanist who first observed the movement of small particles in fluids now known a Brownian motion (1773-1858)
• noun:   a university in Rhode Island
• verb:   fry in a pan until it changes color

  Example: "Brown the meat in the pan"

• adjective:   of a color similar to that of wood or earth
• name:  A surname (very common: 1 in 161 families; popularity rank in the U.S.: #5)