1. a letter or parcel that is un-deliverable by the post office because of a faulty or illegible address.
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Origin: 1880-85; nix + -ie
noun, German Folklore.
1. a female water spirit.
Origin: 1810-20; < German Nixe (Middle High German nickese, Old High German nicchessa; see nix), perhaps construed at time of borrowing as nix + -ie
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