- either of two small, pearl-gray gulls of the genus Rissa, the black-legged R. tridactyla of the North Atlantic and the red-legged and red-billed R. brevirostris, of the Bering Sea, both nesting on narrow cliff ledges and having a rudimentary hind toe.
- either of two oceanic gulls of the genus Rissa, esp R. tridactyla, having a white plumage with pale grey black-tipped wings and a square-cut tail
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