anseri-, anser-

Typical geese.

The word does not refer to geese; instead it refers to a heraldic term describing extremities that terminated first in the heads of serpents and subsequently in the heads of eagles, lions, or other animals; such as, an anserated cross.

A Linnaean order of aquatic birds swimming by means of webbed feet, as the duck, or of lobed feet, as the grebe. In this order were included the geese, ducks, auks, divers, gulls, petrels, etc.

Web-footed, long-necked, typically gregarious migratory aquatic birds usually larger and less aquatic than ducks.

A division of birds including the geese, ducks, and closely allied forms.

Used in some classifications for the swans.

1. Of, pertaining to, or of the nature of a goose; gooselike (as the goose is conventionally thought to be unintelligent); characterized as stupid, silly.
2. As the goose is conventionally (though erroneously) a type of unintelligence: Stupid, silly.

As stated in the Oxford English Dictionary.

Resembling a goose; silly; simple.

Any of various fish-eating diving ducks of the genus Mergus or related genera, having a slim hooked bill.

Between swans, the goose cackles.

Motto of King Otto IV of Brunswick, Germany (1198-1215).

Fox-goose or Egyptian goose.

The Egyptian goose, or Vulpanser, can not rise from the water, and during the floods of the Nile river great numbers are killed by being pursued in canoes.