knurl /ˈnɝ(ə)l/
  節,瘤,隆起
  Knurl n.  A contorted knot in wood; a crossgrained protuberance; a nodule; a boss or projection.
  2. One who, or that which, is crossgrained.
  Knurl v. t. To provide with ridges, to assist the grasp, as in the edge of a flat knob, or coin; to mill.
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