The Collaborative International Dictionary of English v.0.48:
Anseriformes \An`se*ri*for"mes\, n. pl. (Zool.) A division of birds including the geese, ducks, and closely allied forms. [1913 Webster]WordNet (r) 3.0 (2006):
Anseriformes n 1: ducks; geese; swans; screamers [syn: Anseriformes, order Anseriformes]