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phar·ma·co·pe·ia (fahr″mə-ko-peґə) [pharmaco- + Gr. poiein to make] an authoritative treatise on drugs and their preparations; a book containing a list of products used in medicine, with descriptions, chemical tests for determining identity and purity, and formulas for certain mixtures of these substances. It also generally contains a statement of average dosage. The first United States pharmacopeia was published on December 15, 1820, printed in both Latin and English, and its 272 pages included 217 drugs which were considered worthy of recognition. See USP. pharmacopeial adjMedical dictionary. 2011.