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(Science: zoology) Having a well defined ring of colour around the neck.

(Science: zoology) ring-necked duck, 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.

Synonym: ring-neck, ring-necked blackhead, ringbill, tufted duck, and black jack.