The Collaborative International Dictionary of English v.0.48:

Poachard \Poach"ard\ (p[=o]ch"[~e]rd), n. [From Poach to
   stab.] [Written also pocard, pochard.] (Zool.)
   (a) A common European duck (Aythya ferina); -- called also
       goldhead, poker, and fresh-water widgeon, or
       red-headed widgeon.
   (b) The American redhead, which is closely allied to the
       European poachard.
       [1913 Webster]

   Red-crested poachard (Zool.), an Old World duck (Branta
      rufina).

   Scaup poachard, the scaup duck.

   Tufted poachard, a scaup duck (Aythya cristata, or
      Fuligula cristata), native of Europe and Asia.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Aythya ferina
    n 1: heavy-bodied Old World diving duck having a grey-and-black
         body and reddish head [syn: pochard, Aythya ferina]