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Definition of mg

mg: Abbreviation for milligram, a unit of measurement of mass in the metric system equal to a thousandth of a gram. A gram is equal to the mass of one milliliter, one thousandth of a liter, of water at 4 degrees C.

MG (in capital letters) is the abbreviation for the disease myasthenia gravis.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=12080
Last Editorial Review: 10/9/2012

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