01 n. A troy weight containing twenty-four grains, or the twentieth part of a troy ounce; 1.555 grams; as, a pennyweight of gold or of arsenic. …
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A troy weight containing twenty-four grains, or the twentieth part of a troy ounce; 1.555 grams; as, a pennyweight of gold or of arsenic. It is abbreviated dwt or pwt. It was anciently the weight of a silver penny, whence the name.