In biology, the developing offspring from conception to birth; an embryo or fetus together with its surrounding membranes.
Latin term meaning 'thing conceived,' from concipere 'to conceive.' Taken directly from Latin into medical and biological terminology to describe the entire pregnant structure.
Biologists use 'conceptus' to mean the whole package—embryo, placenta, amniotic sac—because it's all one system working together to develop a human!
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