pennyweight

Noun

WordNet 3.0

Noun (1)

  1. a unit of apothecary weight equal to 24 grains
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Webster's Dictionary (GCIDE)

Pennyweight \Pen"ny*weight`\, 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. It is abbreviated dwt or pwt. It was anciently the weight of a silver penny, whence the name. [1913 Webster + PJC]
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