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noun Sheathbill n. (Zool.) Either one of two species of birds composing the genus Chionis, and family Chionidae, native of the islands of the Antarctic seas. Note: They are related to the gulls and the plovers, but more nearly to the latter. The base of the bill is covered with a saddle-shaped horny sheath, and the toes are only slightly webbed. The plumage of both species is white.
Collaborative International Dictionary of English 0.48
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