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avoirdupois
1. Units used to measure the mass of any substance; except precious gems and metals, and drugs.

It includes the pound, short and long tons, ounce, and dram.

2. A system of units of mass based on the pound (0.45 kilograms), which consists of 16 ounces (each of 16 drams) or 7,000 grains (each equal to 65 milligrams).
This entry is located in the following unit: Measurements and Mathematics Terms (page 2)