noun Embryology.
one of the large blastomeres that form toward the vegetal pole in embryos undergoing unequal cleavage.

1875–80; macro- + -mere Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
macromere (ˈmækrəʊˌmɪə)
embryol any of the large yolk-filled cells formed by unequal cleavage of a fertilized ovum

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

macromere mac·ro·mere (māk'rə-mǐr')
A large blastomere.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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