A primitive or primary embryonic cell or layer, especially in early animal development.
From archi- (primitive, original, chief) + blast (from Greek blastos, meaning sprout or germ). The term combines Greek roots to refer to the earliest cells in embryonic development.
When embryologists discovered that all animal embryos start with similar primitive cell layers, they named them 'archiblasts' to reflect that they're the ancient, original blueprint that all complex animals share—it's a window into our evolutionary past.
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