Milligram

n.

1.

A measure of weight, in the metric system, being the thousandth part of a gram, equal to the weight of a cubic millimeter of water, or .01543 of a grain avoirdupois.

Noun

1.

milligram - one thousandth (1/1,000) gram Synonyms: mg

grain, mcg, metric grain, metric weight unit, mg, microgram, weight unit