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Definition of Lake duck
1. Noun. Common scaup of North America; males have purplish heads.
Exact synonyms: Aythya Affinis, Lesser Scaup, Lesser Scaup Duck
Generic synonyms: Bluebill, Broadbill, Scaup, Scaup Duck
Generic synonyms: Bluebill, Broadbill, Scaup, Scaup Duck