Knurl

Pronunciation

Origin

knur + -le("diminutive"), from Middle English knar ("knot in wood"), earlier sense “a stone”, of Unknown origin.

Online Etymology Dictionary|gnarled

gnarl is a later variant, from gnarled, via knurled.

Full definition of knurl

Noun

1. A contorted knot in wood.
2. A crossgrained protuberance; a nodule; a boss or projection.
3. A lined or crossgrained pattern of ridges or indentations rolled or pressed into a part for grip.

Verb

1. To roll or press a pattern of ridges or indentations into a part for grip.