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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Troy·ounce n. See Troy ounce, under Troy weight, above, and under Ounce.
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From: WordNet (r) 2.0

 troy ounce
      n : a unit of apothecary weight equal to 480 grains or one
          twelfth of a pound [syn: ounce, apothecaries' ounce]