archiblast

 [ahr-kuh-blast]  

ar·chi·blast

   [ahr-kuh-blast]
noun Biology.
the formative part of the egg, as distinguished from the part that nourishes the embryo.
Origin:
1875–80; archi- + -blast
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Archiblast is always a great word to know.
So is segmentation. Does it mean:
mode of organization; construction and arrangement of tissues, parts, or organs
the subdivision of an organism or of an organ into more or less equivalent parts; cell division
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