macromere
/ˈmakrə(ʊ)mɪə/Embryology
noun
A relatively large blastomere, formed by unequal division in the fertilized ovum, and usually appearing at the vegetal pole.
Origin
Late 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From macro- + -mere. Compare micromere.