nix or nixie, in Germanic mythology, water sprite. The nixes could assume various shapes, most frequently as half human and half fish. They could do favors for humans, particularly in teaching them bewitching music, but for the most part they were treacherous and malignant.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
More on nix from Infoplease:
See more Encyclopedia articles on: Folklore and Mythology