In developmental biology, the process of gastrulation where layers fold inward; the infolding of tissue layers during embryonic development.
From Greek 'embolos' (insertion, infolding) + '-y' (noun suffix). The term describes the literal insertion and folding of embryonic layers.
When you were a tiny embryo, your cells performed 'emboly'—they folded inward like a geometric origami—and the ancient Greeks had a word for this insertion and folding before microscopes even existed!
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