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. Synonyms: bone, ivory, off-white.

(noun) a shape that is spherical and small. Synonyms: drop, bead. Examples: "He studied the shapes of low-viscosity drops." "Beads of sweat on his forehead."

(verb) gather pearls, from oysters in the ocean.