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| Particle Particle Size Parts Per Million (Ppm) Pathogen Peat Pectine Peptide Permeability Pesticides Pext Ph Phagocyte Polymer Prebiotic Probiotic Protein (Protid) Protein-Prion |
| A substance formed by the union of two or more molecules of the same kind linked end to end into another compound having the same elements in the same proportion, but a higher molecular weight and different physical properties. |