Burl is a type of KNOT or decorative wood grain pattern found in trees. It is created when a tree grows around a foreign object, such as a branch or rock, and forms a rounded shape. The term 'burl' can also refer to the KNOT itself, which is usually found in the trunk of a tree. The crossword solutions for the term 'burl' are 'KNOT, ' referring to the type of KNOT found in trees, 'Ives, ' referring to the American composer Charles Ives, who wrote a song called 'The Burl Ives, ' and 'knar, ' referring to the sound of a burl KNOT being cut.