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[ni-stag-muh s] /nɪˈstæg məs/
a congenital or acquired persistent, rapid, involuntary, and oscillatory movement of the eyeball, usually from side to side.
Origin of nystagmus
1815-25; < New Latin < Greek nystagmós nodding, derivative of nystázein to nod
Related forms
nystagmic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for nystagmus


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
Word Origin
C19: New Latin, from Greek nustagmos
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for nystagmus

medical Latin, from Greek nystagmos "nodding, drowsiness," from nystazein "to nod, be sleepy," from PIE *sneud(h)- "to be sleepy."

Online Etymology Dictionary, © 2010 Douglas Harper
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nystagmus in Medicine

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.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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