from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A North American duck (Aythya collaris) having a distinctive light ring behind the tip of the bill and, in the male, a light chestnut ring around the neck. Also called ring-bill.
from the GNU version of the Collaborative International Dictionary of English
- adj. an American scaup duck (Aythya collaris). The head, neck, and breast of the adult male are black, and a narrow, but conspicuous, red ring encircles the neck. This ring is absent in the female. Called also ring-neck, ring-necked blackhead, ringbill, tufted duck, and black jack.
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