[1] : The Collaborative International Dictionary of English v.0.48

sea widgeon \sea" wid"geon\ zool.
   a the scaup duck.
   b the pintail duck.
       1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

widgeon \widg"eon\, n. probably from an old french form of f.
   vigeon, vingeon, gingeon; of uncertain origin; cf. l. vipio,
   -onis, a kind of small crane. zool.
   any one of several species of fresh-water ducks, especially
   those belonging to the subgenus mareca, of the genus
   anas. the common european widgeon anas penelope and the
   american widgeon anas americana are the most important
   species. the latter is called also baldhead, baldpate,
   baldface, baldcrown, smoking duck, wheat, duck, and
   whitebelly.
   1913 webster

   bald-faced widgeon, or green-headed widgeon, the american
      widgeon.

   black widgeon, the european tufted duck.

   gray widgeon.
   a the gadwall.
   b the pintail duck.

   great headed widgeon, the poachard.

   pied widgeon.
   a the poachard.
   b the goosander.

   saw-billed widgeon, the merganser.

   sea widgeon. see in the vocabulary.

   spear widgeon, the goosander. prov. eng.

   spoonbilled widgeon, the shoveler.

   white widgeon, the smew.

   wood widgeon, the wood duck.
      1913 webster
see also:
mareca anas anas penelope anas americana baldhead baldpate 
baldface baldcrown smoking duck wheat duck 
whitebelly bald-faced widgeon green-headed widgeon black widgeon gray widgeon 
great headed widgeon pied widgeon saw-billed widgeon sea widgeon spear widgeon 
spoonbilled widgeon white widgeon wood widgeon 

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