Akademik

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.
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One-thousandth of a gram.

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mil·li·gram or chiefly Brit mil·li·gramme -.gram n one thousandth of a gram abbr. mg

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n.
one thousandth of a gram. Symbol: mg.

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mil·li·gram (mg) (milґĭ-gram) one thousandth (10−3) of a gram.

Medical dictionary. 2011.