macromere

noun
mac·​ro·​mere | \ˈma-krə-ˌmir \

Definition of macromere 

: a large blastomere — see blastula illustration

First Known Use of macromere

1877, in the meaning defined above

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The first known use of macromere was in 1877

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macromere

noun
mac·​ro·​mere | \ˈmak-rō-ˌmi(ə)r \

Medical Definition of macromere 

: any of the large blastomeres that occur in the hemisphere of a telolecithal egg containing the vegetal pole and that are formed by unequal segmentation — compare micromere

More from Merriam-Webster on macromere

Britannica.com: Encyclopedia article about macromere

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