barnacle goose

noun
1.
a wild goose, Branta leucopsis, of northern Europe and Greenland.
Origin
1760-70; earlier barnacle, Middle English bernacle; compare Middle French bernacle, Neo-Latin bernacula, all derivative of earlier Middle English bernak, bernekke, Anglo-Latin bernaca, Old French bernaque, of uncertain origin
British Dictionary definitions for barnacle goose

barnacle goose

noun
1.
a N European goose, Branta leucopsis, that has a black-and-white head and body and grey wings
2.
a former name for brent goose
Word Origin
C13 bernekke, related to Late Latin bernaca, from the belief that the goose developed from a shellfish; ultimate origin obscure