转速表 zhuànsùbiǎo tachometer Definitions Defs Origin Strokes Stroke Words Sentences Sents 转速 轉速 zhuànsù rotational speed The speed at which an object rotates, often measured in revolutions per minute.表 錶 biǎo noun meter An instrument or gauge used for measuring and displaying a specific quantity, such as electricity, water, or pressure.