Hypertext Webster Gateway: "pennyweight"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pennyweight \Pen"ny*weight`\, n.
A troy weight containing twenty-four grains, or the twentieth
part of an ounce; as, a pennyweight of gold or of arsenic. It
was anciently the weight of a silver penny, whence the name.
From WordNet (r) 1.7 (wn)
pennyweight
n : a unit of apothecary weight equal to 24 grains
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