Webster's English Dictionary

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nix

1. nix \'niks\ n [G, fr. OHG nihhus; akin to OE nicor water monster, Gk 
   nizein] to wash : a water sprite of Germanic folklore usu. having the form 
   of a woman or a  half human and half fish
2. nix n [G nichts nothing] slang  : NOTHING : no one 
3. nix av slang  : NO - used to express disagreement or the withholding of 
   permiss ion
4. nix vt slang  : VETO, FORBID