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In the English-speaking world, 12ᵗʰ – 20ᵗʰ centuries, a unit of mass in the troy weight system, = ¹⁄₂₀ troy ounce = 24 grains = 1.555 173 84 grams. Abbreviated dwt. In imperial weight: 
PENNY-WEIGHT; this consists of 24 Grains, in Troy-Weight, each Grain weighing a Grain of Wheat gathered out of the middle of the Ear, well dry'd.
Worlidge, 1704.
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Last revised: 16 September 2005.