: one of the cells that are produced during cleavage of a zygote and that form the morula

Examples of blastomere in a Sentence

Recent Examples on the Web
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First, the isolated cell can be co-cultured with blastomeres from other embryos biopsied during the IVF cycle (there are almost always multiple embryos undergoing PGD biopsy per cycle). — Wired Blogs, WIRED, 21 Sep. 2006

Word History

Etymology

blasto- + -mere

First Known Use

1875, in the meaning defined above

Time Traveler
The first known use of blastomere was in 1875

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Cite this Entry

“Blastomere.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blastomere. Accessed 29 Sep. 2026.

Medical Definition

: a cell produced during cleavage of a fertilized egg

called also cleavage cell

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