Aythya Americana

from WordNet (r) 3.0 (2006)

Aythya americana
    n 1: North American diving duck with a grey-and-black body and
         reddish-brown head [syn: {redhead}, {Aythya americana}]

from The Collaborative International Dictionary of English v.0.48

Redhead \Red"head`\ (-h?d`), n.
   1. A person having red hair.
      [1913 Webster]

   2. (Zool.)
      (a) An American duck ({Aythya Americana}) highly esteemed
          as a game bird. It is closely allied to the
          canvasback, but is smaller and its head brighter red.
          Called also {red-headed duck}. {American poachard},
          {grayback}, and {fall duck}. See Illust. under
          {Poachard}.
      (b) The red-headed woodpecker. See {Woodpecker}.
          [1913 Webster]

   3. (Bot.) A kind of milkweed ({Asclepias Curassavica}) with
      red flowers. It is used in medicine.
      [1913 Webster]