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knurl

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knurl

[nurl]
–noun
1. a small ridge or bead, esp. one of a series, as on a button for decoration or on the edge of a thumbscrew to assist in obtaining a firm grip.
2. a knur.
–verb (used with object)
3. to make knurls or ridges on.
Also, nurl.


Origin:
1600–10; earlier knurle (n.). See knur, -le
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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knurl   (nûrl)   
n.  
  1. A knob, knot, or other small protuberance.

  2. One of a series of small ridges or grooves on the surface or edge of a metal object, such as a thumbscrew, to aid in gripping.

tr.v.   knurled, knurl·ing, knurls
To provide with knurls; mill.

[Probably diminutive of knur.]
knurled (nûrld) adj., knurl'y adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

knurl 
1608, probably a dim. of M.E. knor "knot" (c.1400), related to gnarl, from P.Gmc. *knur- (cf. Ger. knorren "a knotty excrescence").
Online Etymology Dictionary, © 2001 Douglas Harper
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