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From The Collaborative International Dictionary of English v.0.48:
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