The Collaborative International Dictionary of English v.0.48:

Knurl \Knurl\ (n[^u]rl), n. [See Knar, Gnar.]
   A contorted knot in wood; a crossgrained protuberance; a
   nodule; a boss or projection.
   [1913 Webster]

   2. One who, or that which, is crossgrained.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Knurl \Knurl\ (n[^u]rl), v. t.
   To provide with ridges, to assist the grasp, as in the edge
   of a flat knob, or coin; to mill.
   [1913 Webster]