troy ounce

/trɔɪ aʊns/
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Other forms: troy ounces

Definitions of troy ounce
  1. noun
    a unit of apothecary weight equal to 480 grains or one twelfth of a pound
    synonyms: apothecaries' ounce, ounce
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    type of:
    troy unit
    any of the unit of the troy system of weights
    apothecaries' unit, apothecaries' weight
    any weight unit used in pharmacy; an ounce is equal to 480 grains and a pound is equal to 12 ounces
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