[nys.tag.mus] n [NL, fr. Gk nystagmos drowsiness, fr. nystazein to doze; prob. akin to Lith snusti to doze] (1822): a rapid involuntary oscillation of the eyeballs (as from dizziness) -- nys.tag.mic adj
NYSTAGMUS
Meaning of NYSTAGMUS in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012