Burl

Webster's Dictionary of the English Language

·noun A knot or lump in thread or cloth.

II. Burl ·noun An overgrown knot, or an excrescence, on a tree; also, veneer made from such excrescences.

III. Burl ·vt To dress or finish up (cloth); to pick knots, burs, loose threads, ·etc., from, as in finishing cloth.