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Tuss′ock-grass, a large grass of the same genus with the Cock's-foot Grass of Britain, native to the Falkland Islands, remarkable for forming great tufts—also Tuss′ac-grass; Tuss′ock-moth, a grayish-white moth about an inch long, the caterpillars of which do great mischief in hop-grounds, and are known as Hop-dogs.—adj.