Definition of mg

Reviewed on 3/29/2021

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.

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