apothecaries-weight

apothecaries' weight

noun
a system of weights used chiefly in compounding and dispensing drugs: 20 grains = 1 scruple (℈); 3 scruples = 1 dram (dr); 8 drams = 1 ounce); 12 ounces = 1 pound. The grain, ounce, and pound are the same as in troy weight, the grain alone being the same as in avoirdupois weight.

Origin:
1755–65

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Collins
World English Dictionary
apothecaries' weight
 
n
a system of weights, formerly used in pharmacy, based on the Troy ounce, which contains 480 grains. 1 grain is equal to 0.065 gram

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

apothecaries' weight n.
A system of weights used in compounding prescriptions and in which an ounce equals 480 grains and a pound equals 12 ounces.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
apothecaries' weight   (ə-pŏth'ĭ-kěr'ēz)  Pronunciation Key 
A system of weights used in pharmacy and based on an ounce equal to 480 grains and a pound equal to 12 ounces. It has been largely replaced by measures of the metric system.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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