metric grain

Noun
  1. A weight unit used for pearls or diamonds: 50 mg or 1/4 carat (synset 113745414)
    is a type of: metric weight unit, weight unit - a decimal unit of weight based on the gram
    has: mg, milligram - one thousandth (1/1,000) gram
    is a part of: decigram, dg - 1/10 gram
    same as: grain

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