1) Gnarled 2) Having knurls or knots 3) Milled 
• (a.) Full of knots; gnarled. • (a.) Milled, as the head of a screw, or the edge of a coin.
Knurled (nûrld) adjective 1. Full of knots; gnarled. 2. Milled, as the head of a screw, or the edge of a coin. 
having small ridges on the edge or surface; milled. · having knurls or knots; gnarled.