Filk definition
A genre of music popular among devotees of science fiction and fantasy literature, often involving original lyrics set to familiar melodies.
noun
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Origin of filk
- Alteration of folk originally a typographical error in the title of a manuscript of the essay “The Influence of Science Fiction on Modern American Folk Music” by Lee Jacobs (died 1968), American writer of science-fiction fan fiction
From American Heritage Dictionary of the English Language, 5th Edition