nystagmus Meaning, Definition & Usage
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noun involuntary movements of the eyeballs; its presence or absence is used to diagnose a variety of neurological and visual disorders
WordNet
Nys*tag"mus noun
Etymology
NL., fr. Gr. drowsiness, fr. to nod in sleep, to slumber.Definitions
(Med.) A rapid involuntary oscillation of the eyeballs.