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]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "knurl":
   Vandyke, bilge, blain, blaze, bleb, blister, blob, boss, bow,
   bubble, bulb, bulge, bulla, bump, bunch, burl, button, cahot,
   chine, chop, clump, condyle, convex, crenellate, crenulate, crimp,
   cut, dowel, ear, flange, flap, gall, gash, gnarl, handle, hill,
   hump, hunch, incise, indent, jag, jog, joggle, knob, knot, knur,
   lip, loop, lump, machicolate, mill, mole, mountain, nevus, nick,
   notch, nub, nubbin, nubble, papilloma, peg, picot, pink, rib,
   ridge, ring, scallop, scarify, score, scotch, serrate, shoulder,
   slash, spine, stud, style, tab, tooth, tubercle, tubercule,
   verruca, vesicle, wale, wart, welt