Merriam-Webster's Collegiate® Dictionary, 11th Edition
NIX
I. noun
Etymology: German nichts nothing
Date: 1789
nothing ,
II. transitive verb
Date: circa 1903
veto , reject ,
III. adverb
Date: 1902
no ,
IV. noun
Etymology: German, from Old High German nihhus; akin to Old English nicor water monster and perhaps to Greek nizein to wash
Date: 1833
a water sprite of Germanic folklore