a congenital or acquired persistent, rapid, involuntary, and oscillatory movement of the eyeball, usually from side to side.

1815–25; < Neo-Latin < Greek nystagmós nodding, derivative of nystázein to nod

nystagmic, adjective
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World English Dictionary
nystagmus (nɪˈstæɡməs)
involuntary movement of the eye comprising a smooth drift followed by a flick back, occurring in several situations, for example after the body has been rotated or in disorders of the cerebellum
[C19: New Latin, from Greek nustagmos]

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Medical Dictionary

nystagmus nys·tag·mus (nĭ-stāg'məs)
A rapid, involuntary oscillatory motion of the eyeball.

nys·tag'mic (-mĭk) or nys·tag'moid' (-moid') adj.
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