acardius acephalus

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• acardius acephalus — holoacardius acephalus …   Medical dictionary

• acardius — A twin without a heart that remains viable by using the placental circulation of its mate. a. acephalus acephalocardius; an acardiac conceptus in which the head and thoracic organs are absent; ribs and vertebrae may be present, and upper l …   Medical dictionary

• holoacardius — A separate, grossly defective twin lacking a heart of its own, its blood supply being dependent on a shunt from the placental circulation of a more nearly normal twin; a placental parasitic twin or …   Medical dictionary