Relating to or characteristic of a blastula; being in the blastula stage of development.
From blastula + '-ar' (suffix meaning 'of or relating to'). Standard adjective used in embryology since the late 1800s.
When scientists say 'blastular stage' they mean that specific 4-5 day window when you're a hollow ball of cells before you're a gastrula—it's like naming a specific floor of a building.
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