goosander

 
Pronunciation: /guːˈsandə/

noun (plural or goosanders)

  • a large Eurasian and North American merganser (diving duck), the male of which has a dark green head and whitish underside.
    • Mergus merganser, family Anatidae. North American name: common merganser

Origin:

early 17th century: probably from goose + -ander as in dialect bergander 'shelduck' (the colouring of the male goosander resembling that of the shelduck)