What's the difference between knur and knurl?

Knur

Definition:

• (n.) A knurl.

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Knurl

Definition:

• (n.) A contorted knot in wood; a crossgrained protuberance; a nodule; a boss or projection.
• (n.) One who, or that which, is crossgrained.
• (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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