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

Moby Thesaurus II by Grady Ward, 1.0:

158 Moby Thesaurus words for "wryneck":
   adenoiditis, adrenitis, appendicitis, arteritis,
   arthritis deformans, arthritis fungosa, arthritis pauperum,
   atrophic arthritis, atrophic inflammation, blennorrhagic arthritis,
   bowlegs, brain fever, bronchitis, bunion, bursitis, camelback,
   capillaritis, carditis, catarrh, catarrhal inflammation,
   cerebellitis, cerebral meningitis, cerebritis,
   cerebrospinal meningitis, chronic infectious arthritis,
   chronic inflammation, cirrhotic inflammation, cleft palate,
   climactic arthritis, clitoritis, clubfoot, colitis,
   collagen disease, conjunctivitis, crookback, cystitis, defacement,
   deformation, deformity, degenerative arthritis,
   diffuse inflammation, disfigurement, encephalitis, endocarditis,
   enteritis, equine encephalomyelitis, exudative inflammation,
   fibroid inflammation, flatfoot, focal inflammation, freakishness,
   gastritis, gingivitis, glossitis, gonococcal arthritis,
   gonorrheal arthritis, gonorrheal rheumatism, gout, gouty arthritis,
   harelip, hemophilic arthritis, hepatitis, humpback, hunchback,
   hyperplastic inflammation, hypertrophic arthritis,
   hypertrophic inflammation, infectional arthritis,
   infectious hepatitis, inflammation, irritable bowel syndrome,
   knock-knee, kyphosis, laryngitis, lordosis, lumbago,
   lumbar rheumatism, malconformation, malformation, mastoiditis,
   meningitis, menopausal arthritis, metastatic inflammation,
   metritis, milk leg, misproportion, misshape, monstrosity,
   mucous colitis, mumps meningitis, mutilation, myelitis,
   necrotic inflammation, nephritis, neuritis,
   obliterative inflammation, ophthalitis, ophthalmia, orchitis,
   osseous rheumatism, osteitis, osteoarthritis, osteomyelitis,
   otitis, ovaritis, paradental pyorrhea, periodontitis, peritonitis,
   pharyngitis, phlebitis, podagra, proliferative arthritis,
   prostatitis, pyonephritis, pyorrhea, pyorrhea alveolaris,
   reactive inflammation, rheumatism, rheumatiz, rheumatoid arthritis,
   rhinitis, sclerosing inflammation, seroplastic inflammation,
   serous inflammation, serum hepatitis, simple inflammation,
   sinusitis, spastic colon, specific inflammation, splayfoot,
   subacute rheumatism, suppurative arthritis,
   suppurative inflammation, swayback, syphilitic arthritis, talipes,
   tennis elbow, teratology, testitis, thrombophlebitis, tonsilitis,
   torticollis, toxic inflammation, traumatic inflammation,
   truncation, tuberculous arthritis, tuberculous rheumatism,
   ulcerative colitis, uratic arthritis, ureteritis,
   urethral arthritis, urethritis, uteritis, vaginitis, valgus,
   vertebral arthritis, visceral rheumatism, vulvitis