nys·tag·mus 
(nĭ-stăgməs)
(nĭ-stăgməs)n.
A rapid, involuntary, oscillatory motion of the eyeball.
[New Latin, from Greek nustagmos, drowsiness.]
nys·tagmic (-mĭk) adj.
- dishware
- dishwasher
- dishwashing
- dishwater
- dishy
- disillusion
- disillusionment
- disillusive
- disincarnate
- disincentive
- disinclination
- disincline
- disinclined
- disincorporate
- disincorporation
- disinfect
- disinfectant
- disinfection
- disinfest
- disinfestation
- disinflation
- disinflationary
- disinform
- disinformant
- disinformation