螺纹钻 luówénzuàn twist drill Origin Definitions Defs Strokes Stroke Words Sentences Sents 螺纹 螺紋 luówén screw thread The spiral ridge or groove on the surface of a screw, bolt, or inside a nut; also called 螺丝扣 luósīkòu.钻 鑽 zuàn drill a tool used for drilling or boring, such as an auger or power drill