Dictionary
ounce
Pronunciation: (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.