acardius
noun
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Medical Definition of acardius
: one of a pair of twin fetuses that develops without a heart and receives its blood supply from its twin through vascular connections on the placenta … due to the parasitic relationship of the acardius, there is a high risk of mortality (50-75%) in the donor twin … —Ona Marie Faye-Peterson et al., Handbook of Placental Pathology, 2006
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