• Webster's Revised Unabridged Dictionary
    • n Knurl nûrl A contorted knot in wood; a crossgrained protuberance; a nodule; a boss or projection.
    • Knurl One who, or that which, is crossgrained.
    • v. t Knurl nûrl To provide with ridges, to assist the grasp, as in the edge of a flat knob, or coin; to mill.
    • ***
Century Dictionary and Cyclopedia
    • n knurl A knot; a hard substance; a nodule of stone; a protuberance in the bark of a tree.
    • n knurl A deformed dwarf; a humpback.
    • n knurl In photography, a milled-edge roller used for dotting and softening outrunning lines and making dark spaces lighter.
    • ***
Chambers's Twentieth Century Dictionary
    • n Knurl nėrl (Burns) a humpback.
    • Knurl Same as Gnarl, Knarl.
    • ***


Webster's Revised Unabridged Dictionary
See Knar Gnar


In literature:

It may be spaced and filed, or it may be knurled, as shown in Fig.
"Scientific American Supplement, No. 312, December 24, 1881" by Various
The knurled retaining screw turned easily; the cup dropped into Brett's hand.
"It Could Be Anything" by John Keith Laumer
You focus the 'scope eyepiece by turning this knurled knob.
"The Flying Stingaree" by Harold Leland Goodwin
Ennis, tensing to spring toward Ruth, saw the two priests at the gray mechanism swiftly turn the knurled black knobs.
"The Door into Infinity" by Edmond Hamilton
Concave knurls are sometimes used for knurling rounded edges on screw heads, etc.
"Turning and Boring" by Franklin D. Jones

In news:

Lucifer Furnaces, Inc recently supplied a fifth tempering oven to Accu Trak Tool Corp. A leading manufacturer of precision knurling wheels and holders.
Zak Tool 's Knurled Flat Grip Handcuff Key is available in a desinger pink.
According to the company, the kit is easy to use, and tough with a diamond-knurled grip and all-metal housing.