metric grain


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Noun1.metric grain - a weight unit used for pearls or diamonds: 50 mg or 1/4 caratmetric grain - a weight unit used for pearls or diamonds: 50 mg or 1/4 carat
metric weight unit, weight unit - a decimal unit of weight based on the gram
mg, milligram - one thousandth (1/1,000) gram
decigram, dg - 1/10 gram