Nystagmus

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Nystagmus \Nys*tag"mus\, n. [NL., fr. Gr. ? drowsiness, fr. ? to
     nod in sleep, to slumber.] (Med.)
     A rapid involuntary oscillation of the eyeballs.
     [1913 Webster]

From WordNet (r) 2.0 [wn]:



  nystagmus
       n : involuntary movements of the eyeballs; the presence or
           absence of nystagmus is used to diagnose a variety of
           neurological and visual disorders