n.1. A white amorphous powder, Ca3(PO4)2, used in ceramics, rubber, fertilizers, and plastic stabilizers and as a food supplement.
2. A dibasic white crystalline powder, CaHPO4, used as an animal food, as a plastic stabilizer, and in glass and toothpaste.
3. A monobasic colorless deliquescent powder, Ca(H2PO4)2, used in baking powders, as a plant food, as a plastic stabilizer, and in glass.