acardius

noun
acar·​dius | \ (ˈ)ā-ˈkärd-ē-əs How to pronounce acardius (audio) \

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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