1 [nik-see]
a letter or parcel that is undeliverable by the post office because of a faulty or illegible address.

1880–85; nix1 + -ie Unabridged


2 [nik-see]
noun German Folklore.
a female water spirit.

1810–20; < German Nixe (Middle High German nickese, Old High German nicchessa; see nix2), perhaps construed at time of borrowing as nix2 + -ie Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nixie (ˈnɪksɪ)
German myth a female water sprite, usually unfriendly to humans
[C19: see nix]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"water fairy," 1816 (introduced by Sir Walter Scott), from Ger. Nixie, from O.H.G. nihhussa "water sprite," fem. of nihhus, from P.Gmc. *nikwiz- (cf. O.N. nykr, O.E. nicor "water spirit, water monster," also used to gloss hippopotamus; Grendel's mother in "Beowulf" was a nicor), perhaps from PIE *nigw-
(cf. Skt. nenkti "washes," Gk. nizo "I wash," O.Ir. nigid "washes").
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


in Germanic mythology, a water being, half human, half fish, that lives in a beautiful underwater palace and mingles with humans by assuming a variety of physical forms (e.g., that of a fair maiden or an old woman) or by making itself invisible. One of three attributes may betray the disguises of nixes: they are music lovers and excellent dancers, and they have the gift of prophecy. Usually malevolent, a nix can easily be propitiated with gifts. In some regions, nixes are said to abduct human children and to lure people into deep water to drown. According to some sources, nixes can marry human beings and bear human children.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Mail owners can receive change of address and nixie information at no charge.
But then he finds a four-leaf clover that enables him to see a water nixie.
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