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wraith \RAYTH\ (noun) – 1 : An apparition of a living person seen before death; hence, an apparition; a specter; a ghost. 2 : A shadowy or insubstantial form, appearance, or representation of something.
“I could almost believe that it was the wraith of Hendrika doomed to keep an eternal watch over the bones of the woman her jealous rage had done to death.” — H. Rider Haggard, ‘All Adventure: Allan’s Wife/Marie’
Wraith is from Scottish warth, probably originally “a guardian angel, hence a person’s ghost seen — as a warning or means of protection — immediately before death, hence any apparition,” from Old Norse vörthr, “watcher, guardian.”