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em-1

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  1. variant of en-1 before b, p, and sometimes m: embalm.
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Compare im-1.

em-2

  1. variant of en-2 before b, m, p, ph: embolism, emphasis.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for em-

em-

prefix
  1. before b, m, and p, a variant of en- 1, en- 2
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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

Word Origin and History for em-

1

from French assimilation of en- to following labial (see en- (1)). Also a prefix used to form verbs from adjectives and nouns.

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2

representing Latin ex- assimilated to following -m- (see ex-).

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Online Etymology Dictionary, © 2010 Douglas Harper

em- in Medicine

em-

pref.
  1. Variant ofen-