The Collaborative International Dictionary of English v.0.48:

Ringneck \Ring"neck`\, n.
   1. (Zool.) Any one of several species of small plovers of the
      genus Aegialitis, having a ring around the neck. The
      ring is black in summer, but becomes brown or gray in
      winter. The semipalmated plover (Aegialitis semipalmata)
      and the piping plover (Aegialitis meloda) are common
      North American species. Called also ring plover, and
      ring-necked plover.
      [1913 Webster]

   2. (Zool.) The ring-necked duck.
      [1913 Webster]