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Related to apothecaries' weight: avoirdupois weight
apothecaries' weight[ə′päth·ə‚ker·ēz ′wāt]
A system of units of mass, usually of drugs, in which 1 pound equals 5760 grains or 1 troy pound.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.