- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for nystagmus
On the right, nystagmus on fixation, fingers are counted at 5-6 feet.
These were nystagmus, paresis of facial muscles, laryngeal spasms, etc.
Nystagmus occasionally occurs in monocular fixation (with exclusion of the other eye).
Not to complicate the question, however, I have excluded all cases of nystagmus from the following investigation.
In Figure L 3a the nystagmus occurs only in males and descends through unaffected females.
- 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
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
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
- A rapid, involuntary oscillatory motion of the eyeball.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.