nystagmus: Meaning and Definition of

nys•tag•mus

Pronunciation: (ni-stag'mus), [key]
— n.
  1. a congenital or acquired persistent, rapid, involuntary, and oscillatory movement of the eyeball, usually from side to side.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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