Dictionary![]() ![]() ouncePronunciation: (ouns), [key] —n. 1. a unit of weight equal to 437.5 grains or 1/16 pound (28.349 grams) avoirdupois. 2. a unit of 480 grains, 1/12 pound (31.103 grams) troy or apothecaries' weight. 3. a fluid ounce. 4. a small quantity or portion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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