variant of en-1 before b, p, and sometimes m: embalm.
Definition for em- (2 of 2)
variant of en-2 before b, m, p, ph: embolism, emphasis.
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British Dictionary definitions for em-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medicine definitions for em-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.