Definitions of pearl:

• noun:   a smooth lustrous round structure inside the shell of a clam or oyster; much valued as a jewel
• noun:   a shade of white the color of bleached bones
• noun:   a shape that is small and round
• verb:   gather pearls, from oysters in the ocean
• name:  A female given name (common: 1 in 1063 females; popularity rank in the U.S.: #224)
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #4846)