[mez-uh-meer, mes-, mee-zuh-, -suh-]
noun Embryology.
  1. a blastomere of intermediate size between a micromere and a macromere.
  2. the intermediate zone of the mesoderm.

Origin of mesomere

First recorded in 1900–05; meso- + -mere Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

mesomere in Medicine


  1. A blastomere of intermediate size that is larger than a micromere but smaller than a macromere.
  2. The middle zone of the mesoderm of a chordate embryo, from which excretory tissue develops.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.