burl (
http://definr.com/burl)
n 1: the wood cut from a tree burl or outgrowth; often used
decoratively in veneer
2: a large rounded outgrowth on the trunk or branch of a tree
3: soft lump or unevenness in a yarn; either an imperfection or
created by design [syn:
slub,
knot]
v : remove the burls from cloth