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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
http://www.medterms.com/script/main/art.asp?articlekey=16166
Last Editorial Review: 10/9/2012

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