"hard excrescence," c. 1600, probably a diminutive of Middle English knor "knot" (c. 1400), related to gnarled, from Proto-Germanic *knur- (cognates: German knorren "a knotty excrescence"). Related: Knurly.
实用例句
1. There are lots of advantages by cold extrusion for straight knurl nut in a single process.
