1. A preparation made by extracting a crude drug, precipitating it from the solution, and drying.
2. Increasing the amount of solute in a given volume of solution by evaporation of the solvent.
3. The quantity of a substance per unit volume or weight. In renal physiology, symbol U for urinary concentration, P for plasma concentration; in respiratory physiology, symbol C for amount per unit volume in blood, F for fractional concentration (mole fraction or volume per volume) in dried gas; subscripts indicate location and chemical species.

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