burl

noun

1. a knot in wool, thread, yarn, etc. that gives a nubby appearance to cloth
2. a kind of knot on some tree trunks or woody roots
3. veneer made from wood with burls in it

Etymology: ME burle < OFr bourle, flocks or ends of threads < VL *burrula, small flock of wool < LL burra, wool

adjective

having a finish or veneer of or like burl

transitive verb

to finish (cloth) by taking out the burls, loose threads, etc.