
The sheathbills are a family of birds, Chionidae. Classified in the wader order Charadriiformes, the family contains one genus, Chionis, with only two species. They breed on subantarctic islands and the Antarctic Peninsula, and the snowy sheathbill migrates to the Falkland Islands and coastal southern South America in the southern winter; they are...
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• (n.) Either one of two species of birds composing the genus Chionis, and family Chionidae, native of the islands of the Antarctic seas.
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either of two species of shorebirds comprising the genus Chionis, family Chionididae, the only bird family confined to South Polar regions. It is ... [1 related articles]
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http://www.britannica.com/eb/a-z/s/78

<ornithology> Either one of two species of birds composing the genus Chionis, and family Chionidae, native of the islands of the Antarctic.seas. ... 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...
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Sheath'bill` noun (Zoology) Either one of two species of birds composing the genus
Chionis , and family
Chionidæ , native of the islands of the Antarctic seas. » They are related to the gulls and the plovers, but more nearly to the latter. The base of the bill is covered with...
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http://www.encyclo.co.uk/webster/S/84
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