burl (n.)

mid-15c., "small knot in cloth or thread," from Old French bourle "tuft of wool," which perhaps is related to the root of bur, or from Vulgar Latin *burrula "small flock of wool," from Late Latin burra "wool," a word of unknown origin. In American English also "a knot or excrescence on a walnut or other tree" (1868).

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