knurln.
英 nɜːl | 美 nɝl
中文n. 隆起；节，瘤；硬节
词根词源
knurl (n.)"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.
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