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a system of weights based on pounds and ounces, widely used in English-speaking countries for commodities other than drugs, precious stones, and precious metals. See also Table of Weights and Measures in the Appendix.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
avoirdupois systemA non-SI (International System) system of weights; the base unit, the avoirdupois pound, is equal to 453.6 g
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.