# nystagmus

> English word · Noun · IPA /nɪˈstæɡ.məs/ · frequency rank #87,623

## Definitions
1. rapid involuntary eye movement, usually lateral

## Etymology
First attested in 1798. From New Latin nystagmus, from Ancient Greek νυσταγμός (nustagmós, “nodding, drowsiness”), from νυστάζω (nustázō, “nod, be sleepy”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/nystagmus