ounce : Idioms & Phrases
apothecaries' ounce
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noun a unit of apothecary weight equal to 480 grains or one twelfth of a pound
apothecaries' ounce; ounce.
WordNet
Fluid ounce
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noun a British imperial unit of capacity or volume (liquid or dry) equal to 8 fluid drams or 28.416 cubic centimeters (1.734 cubic inches)
fluidounce.
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noun a United States unit of capacity or volume equal to 1.804 cubic inches
fluidounce.
WordNet
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(a) In the United States, a measure of capacity, in apothecaries' or wine measure, equal to one sixteenth of a pint or 29.57 cubic centimeters. This, for water, is about 1.04158 ounces avoirdupois, or 455.6 grains.(b) In England, a measure of capacity equal to the twentieth part of an imperial pint. For water, this is the weight of the avoirdupois ounce, or 437.5 grains.
Webster 1913
troy ounce
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noun a unit of apothecary weight equal to 480 grains or one twelfth of a pound
apothecaries' ounce; ounce.