<p><strong>Noun</strong></p><ul><li>a unit of weight equal to 437.5 grains or 1/16 pound (28.35 grams) avoirdupois.</li><li>a unit of 480 grains, 1/12 pound (31.1 grams) troy or apothecaries' weight.</li><li>a fluid ounce.</li><li>a small quantity or portion.</li></ul>