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Pennyweight definitions

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Webster's 1828 Dictionary

PEN'NYWEIGHT, n. A troy weight containing twenty four grains, each grain being equal in weight to a grain of wheat from the middle of the ear, well dried. It was anciently the weight of a silver penny,whence the name. Twenty penny-weights make an ounce troy.

WordNet (r) 3.0 (2005)

n
1: a unit of apothecary weight equal to 24 grains

Merriam Webster's

noun Date: 14th century — see weight table

Oxford Reference Dictionary

n. a unit of weight, 24 grains or one-twentieth of an ounce troy.

Webster's 1913 Dictionary

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.