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|Noun||1.||apothecaries' ounce - a unit of apothecary weight equal to 480 grains or one twelfth of a pound|
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
pennyweight - a unit of apothecary weight equal to 24 grains