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Definition of mackerel gull in English:
mackerel gull
noun
1US (chiefly New England regional), the black-headed gull, Larus ridibundus.
2US (chiefly New England regional), a tern.
3The razorbill, Alca torda.
Origin
Late 18th century; earliest use found in Jeremy Belknap (1744–1798), Congregationalist minister in America and historian.
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