gastrulation
noun/ˌɡæstrʊˈleɪʃən/
Frequency rank: #19,840 most common English word
Meaning
The stage of embryonic development in which a single-layered blastula reorganizes into a multi-layered structure with distinct germ layers.

Example sentence
During early embryonic development, the process of gastrulation transforms a simple ball of cells into a three-layered structure.
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