American Heritage® Dictionary of the English Language, Fourth Edition
- n. 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.
GNU Webster's 1913
- n. the system of weights by which medical prescriptions were formerly compounded. The pound and ounce are the same as in Troy weight; they differ only in the manner of subdivision. The ounce is divided into 8 drams, 24 scruples, 480 grains. See Troy weight.
- n. any weight unit used in pharmacy; an ounce is equal to 480 grains and a pound is equal to 12 ounces
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