毫米汞柱 háomǐgǒngzhù millimeter of mercury Origin Definitions Defs Strokes Stroke Words Sentences Sents 毫米 háomǐ noun millimeter millimeter (mm); a unit of length equal to one-thousandth of a meter汞柱 gòngzhù mercury column the vertical line or tube of liquid mercury in a device such as a thermometer or barometer used to indicate temperature or pressure