Medical Definition of Milligram
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.
The abbreviation for milligram is mg.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 10/9/2012
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