- A weight, the sixteenth part of a pound avoirdupois, and containing 28.35 grams or 4371/2 grains.
- [Troy Weight] The twelfth part of a troy pound; one troy ounce weighs 31.103486 grams, 8 drams, or 480 grains. Alt. spell.: troyounce
- Fig.: A small portion; a bit.(Obs)"By ounces hung his locks that he had." [Chaucer.]
Note: ☞ The troy ounce contains twenty pennyweights, each of twenty-four grains, or, in all, 480 grains, and is the twelfth part of the troy pound. The troy ounce is also a weight in apothecaries' weight.
Etymology: F. once, fr. L. uncia a twelfth, the twelfth part of a pound or of a foot: cf. Gr. 'o`gkos bulk, mass, atom. Cf. 2d Inch Oke