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The Collaborative International Dictionary of English v.0.48 (gcide)

Ounce \Ounce\ (ouns), n. [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}.]
1. A unit of mass or weight, the sixteenth part of a pound
avoirdupois, and containing 28.35 grams or 4371/2 grains.
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2. (Troy Weight) The twelfth part of a troy pound; one troy
ounce weighs 31.103486 grams, 8 drams, or 480 grains.
[1913 Webster PJC]

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. [Troy ounce is
sometimes written as one word, {troyounce}.]
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3. Fig.: A small portion; a bit. [Obs.]
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By ounces hung his locks that he had. --Chaucer.
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{Fluid ounce}. See under {Fluid}, n.
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Ounce \Ounce\, n. [F. once; cf. It. lonza, Sp. onza; prob. for
lonce, taken as l'once, fr. L. lynx, Gr. ?, or an (assumed)
fem. adj. lyncea, from lynx. Cf. {Lynx}.] (Zool.)
A feline quadruped ({Felis irbis} syn. {Felis uncia})
resembling the leopard in size, and somewhat in color, but it
has longer and thicker fur, which forms a short mane on the
back. The ounce is pale yellowish gray, with irregular dark
spots on the neck and limbs, and dark rings on the body. It
inhabits the lofty mountain ranges of Asia. Called also
{once}.
[1913 Webster] Ounded