Meaning of nixie

nix•ie

Pronunciation: (nik'sē), [key]
— n.
  1. a letter or parcel that is undeliverable by the post office because of a faulty or illegible address.

nix•ie

Pronunciation: (nik'sē), [key]
— n. Germanic Folklore.
  1. a female water spirit.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.