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a combining form meaning “middle,” used in the formation of compound words:
Also, especially before a vowel, mes-.
Origin of meso-
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. 2018.
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British Dictionary definitions for meso-


combining form
middle or intermediate: mesomorph
Word Origin
from Greek misos middle
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
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Word Origin and History for meso-

word-forming element meaning "middle, intermediate, halfway," sometimes mes- before vowels, comb. form of Greek mesos "middle, in the middle; middling, moderate; between" (see medial (adj.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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meso- in Medicine

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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