a combining form meaning “middle,” used in the formation of compound words: mesocephalic.
Also, especially before a vowel, mes-.

combining form representing Greek mésos middle, in the middle; akin to Latin medius; see mid1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
meso- or (before a vowel) mes-
combining form
middle or intermediate: mesomorph
[from Greek misos middle]
mes- or (before a vowel) mes-
combining form
[from Greek misos middle]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

sometimes mes- before vowels," comb. form of Gk. mesos "middle" (see medial).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

meso- or mes-

  1. In the middle; middle: mesoderm.

  2. Intermediate: mesomere.

  3. Mesentery: mesoileum.

  4. Characterizing a superimposable isomer: meso-2,3-dichlorobutane.

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