I. ˈniksē, -si noun
( -s )
Etymology: German, female nix, from Old High German nicchessa, feminine of nihhus nix
: nix I
II. noun
also nixy “
( plural nixies )
Etymology: nix (II) + -ie, -y
: a piece of mail that is undeliverable because illegibly or incorrectly addressed
III. transitive verb
also nixy “
( nixied ; nixied ; nixying ; nixies )
: to stamp (a piece of mail) as a nixie and dispatch to sender or to dead-letter office