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ounce(oz)
(ouns)
in the apothecaries' system, a unit of weight equal to 1/12 of a pound or 480 grains (31.103 grams; symbol ℥.
in the avoirdupois system, a unit of weight equal to 1/16pound (28.3495 grams).
fluid ounce
in the apothecaries' system, a unit of liquid measure equal to 8 fluid drams (29.57 mL).
a unit of capacity (liquid measure) of the apothecaries' system. In the United States, it is 8 fluid drams, one sixteenth of a pint, or the equivalent of 29.57 mL. In Great Britain, it is an imperial ounce and is 8 (imperial) fluid drams but is one twentieth of an (imperial) pint, or 28.41 mL.

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