mumug

μμg

Symbol for micromicrogram.
Farlex Partner Medical Dictionary © Farlex 2012

micromicrogram

(mī″krō-mī′krō-grăm),

μμg

Obsolete term for 1 millionth of a microgram; now called a picogram, or 1012gram.
Medical Dictionary, © 2009 Farlex and Partners