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.
Origin: F. Once, fr. L. Uncia a twelfth, the twelfth part of a pound or of a foot: cf. Gr. Bulk, mass, atom. Cf. 2d Inch, Oke.
(Science: zoology) A feline quadruped (felis irbis, or uncia) resembling the leopard in size, and somewhat in colour, 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.
Origin: 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.