A flat disc-shaped region in an embryo where cells begin to multiply during early development in birds and reptiles.
From Greek 'blastos' (germ, bud) + Latin 'discus' (disc). The term was coined by embryologists in the 19th century to describe the visible germinal disc in eggs.
The blastodisc is like nature's construction blueprint—it's the only part of a bird egg where cells actually divide to build the embryo, while the rest remains as food.
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