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bone china a fine type of white porcelain produced by mixing bone ash or calcium phosphate with the clay.
phosphate rock sedimentary rocks that contain large amounts of calcium phosphate, used in making fertilizer, phosphorous chemicals, and the like.
phosphorus a chemical element that has fifteen protons in each nucleus, that is found naturally only in compounds, esp. biologically essential compounds such as calcium phosphates and nucleotide phosphates, and that can be isolated in various allotropic forms, one of which is a poisonous whitish yellow solid that is luminous at room temperature because of slow oxidation. (symbol: P) [1/2 definitions]