
(from the article `textile`) Novelty yarns include a wide variety of yarns made with such special effects as slubs, produced by intentionally including small lumps in the yarn ...
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http://www.britannica.com/eb/a-z/n/59

A yarn that is intentionally produced to have a special or unique effect. These effects can be produced by twisting together uneven single yarns, by using yarns that contain irregularities, or by twisting yarns that contain a color variance. A slubbed yarn is an example of a novelty yarn.
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