calcium phosphaten.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.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.calcium phosphate n 1. (Elements & Compounds) the insoluble nonacid calcium salt of orthophosphoric acid (phosphoric(V) acid): it occurs in bones and is the main constituent of bone ash. Formula: Ca3(PO4)2 2. (Elements & Compounds) any calcium salt of a phosphoric acid. Calcium phosphates are found in many rocks and used esp in fertilizers Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014cal?cium phos?phate n. a phosphate of calcium, used as a fertilizer, food additive, and in baking powder. [1865?70] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.