In embryology, the innermost layer of cells formed during early development; the endoderm.
From Greek 'entos' (within, inside) plus 'blastos' (bud, sprout, or germ cell). This scientific term emerged in 19th-century embryology to describe the developmental layers of organisms.
The 'blast' in 'entoblast' is the same 'blast' that appears in 'fibroblast' and 'osteoblast'—it's Greek for 'sprout,' which makes sense because these are the actual sprouting cells that build your body! Scientists reuse ancient Greek words like building blocks to name new discoveries.
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