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1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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micromicro- in Medicine

micromicro- pref.
Symbol μμ
One-trillionth (10-12): micromicrogram.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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