An apothecaries' weight of 20 grains or one-third of a dram. [L. scrupulus, a small sharp stone, a weight, the 24th part of an ounce, a s., dim. of scrupus, a sharp stone]
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scru·ple 'skrü-pəl n a unit of apothecaries' weight equal to 20 grains or 1/3 dram or 1.296 grams
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n.
a unit of weight used in pharmacy. 1 scruple = 1.295 g (20 grains). 3 scruples = 1 drachm.
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scru·ple (Э) (scr) (skrooґpəl) [L. scrupulus, dim. of scrupus a sharp stone, a worry or anxiety] a unit of mass (weight) of the apothecaries' system, being 20 grains, or the equivalent of 1.296 g.Medical dictionary. 2011.