: a blastomere of medium size
also : an intermediate part of the mesoderm

Word History

Etymology

meso- + -mere

First Known Use

circa 1900, in the meaning defined above

Time Traveler
The first known use of mesomere was circa 1900

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Cite this Entry

“Mesomere.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mesomere. Accessed 8 Jul. 2026.

Medical Definition

: a blastomere of medium size
also : an intermediate part of the mesoderm

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