"involuntary motion of the eyes," 1790, medical Latin, from Greek nystagmos "nodding, drowsiness," from nystazein "to nod, slumber, be sleepy," from PIE *sneud(h)- "to be sleepy." Beekes compares Baltic words such as Lithuanian snūsti "to slumber away." Related: Nystagmatic.
nymphette
nympho
nympholepsy
nymphomania
nymphomaniac
nystagmus
O
o'clock
o'er
O.D.
oaf
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}