The Collaborative International Dictionary of English v.0.48:

Wryneck \Wry"neck\, n. (Med.)
   [1913 Webster]
   1. A twisted or distorted neck; a deformity in which the neck
      is drawn to one side by a rigid contraction of one of the
      muscles of the neck; torticollis.
      [1913 Webster]

   2. a person suffering from torticollis.
      [PJC]

   3. (Zool.) Any one of several species of Old World birds of
      the genus Jynx or subfamily Jynginae, allied to the
      woodpeckers; especially, the common European species
      (Jynx torguilla); -- so called from its habit of turning
      the neck around in different directions. Called also
      cuckoo's mate, snakebird, summer bird, tonguebird,
      and writheneck.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

wryneck
    n 1: an unnatural condition in which the head leans to one side
         because the neck muscles on that side are contracted [syn:
         torticollis, wryneck]
    2: Old World woodpecker with a peculiar habit of twisting the
       neck