Source : Webster's Revised Unabridged Dictionary (1913)

Anseriformes \An`se*ri*for"mes\, n. pl. (Zo["o]l.)
   A division of birds including the geese, ducks, and closely
   allied forms.

Source : WordNet®

Anseriformes
     n : ducks; geese; swans; screamers [syn: {order Anseriformes}]