Medical Definition of Hg
Hg: Symbol for the metallic element mercury.
The abbreviation "mm Hg" means millimeters of mercury, the height of a column of mercury, as in a blood pressure reading.
Mercury is poisonous to people. See Mercury poisoning.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 10/9/2012
Medical Dictionary Definitions A - Z
Search Medical Dictionary
eMedicineHealth Top News