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Webster 1913 Edition

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Noun.

[NL., fr. Gr. [GREEK] drowsiness, fr. [GREEK] to nod in sleep, to slumber.]

(Med.)

A rapid involuntary oscillation of the eyeballs.

nystagmus ‎(plural nystagmuses)

rapid involuntary eye movement, usually lateral
- 1970: For months Travis had seen his solitary figure, shoulders hunched inside the flying jacket, in more and more newsreels, as an extra in war films, and then as a patient in an elegant ophthalmic film on nystagmus — JG Ballard, The Atrocity Exhibition

rapid involuntary eye movement

nystagmus m