burl
noun
3.
soft lump or unevenness in a yarn; either an imperfection or created by design
verb
Origin
From Middle English burle (“a knot or flaw in cloth”), from Old French bourle (“flocks or ends of threads which disfigure cloth”), diminutive of Old French bourre, from Medieval Latin burra (“flock of wool, coarse hair”).
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.