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gram definition: A gram is a unit of measure in the metric system that equals one thousandth of a kilogram. (noun) An example of a gram is .035 ounces or four pinches of salt. ...
A gram (g) is the basic unit of measurement of mass used in the metric system. Nanograms (ng) and milligrams (mg) are both units of grams. Nano means one-billionth. Therefore, a nanogram is a billionth of a gram. Milli means one-thousandth. Therefore a milligram is a thousandth of a gram. One milligram is equal to one million nanograms.