from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A unit of mass equal to one thousandth (10-3) of a milligram or one millionth (10-6) of a gram.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A unit of mass equal to 0.000 001 grams. Symbol: μg or mcg

from The Century Dictionary and Cyclopedia

  • n. The millionth part of a gram, being about of a grain troy.
  • n. A photograph or a drawing of a microscopic object.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. one millionth (1/1,000,000) gram


micro- + gram (Wiktionary)



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