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Hebrew: dishon, meaning “springing”, (Deut. 14:5)
It is supposed to be the Antelope addax. It is described as “a large animal, over 3½ feet high at the shoulder, and, with its gently-twisted horns, 2½ feet long. Its color is pure white, with the exception of a short black mane, and a tinge of tawny on the shoulders and back.”, Tristram's Natural History.