mcg

Noun
  1. One millionth (1/1,000,000) gram (synset 113745039)
    is a type of: metric weight unit, weight unit - a decimal unit of weight based on the gram
    has: nanogram, ng - one billionth (1/1,000,000,000) gram
    is a part of: mg, milligram - one thousandth (1/1,000) gram
    same as: microgram

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