n. A bowl; a patella.n. An incrustation which forms on bronze after a certain amount of exposure to the weather, or after burial beneath the ground.n. By extension, the surface-texture or -color which other works of decorative art, as a wooden cabinet or the like, gain through the action of time.n. The surface, produced partly by accretion, partly by discoloration and the effects of acid in the soil, given to marble by long inhumation.n. [capitalized] [NL.] In conch., a genus of gastropods.