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micromicro-

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  1. pico-.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

micromicro- in Medicine

micromicro-

pref. Symbol μμ
  1. One-trillionth (10-12):micromicrogram.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.