Relating to or occurring outside the chorion, the outermost membrane surrounding an embryo.
From 'exo-' (outside) and 'chorionic,' derived from 'chorion,' a Greek word for skin or membrane used in embryology since ancient times but formalized in the 19th century.
The chorion becomes part of the placenta, so when doctors talk about exochorionic bleeding, they're describing a potentially serious complication where blood pools outside this critical pregnancy membrane.
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