from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Either of two pigeonlike shore birds (Chionia alba or C. minor) of Antarctic regions, having white plumage and a horny covering on the base of the bill.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Either of two species of scavenging birds in the family Chionididae which breed only on the Antarctic Peninsula and subantarctic islands.
from the GNU version of the Collaborative International Dictionary of English
- n. Either one of two species of birds composing the genus Chionis, and family Chionidæ, native of the islands of the Antarctic seas.
from The Century Dictionary and Cyclopedia
- n. A sea-bird of the family Chionididæ.
From sheath + bill (Wiktionary)