| 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 omphalosite. Compare: acardius. Origin: holo-+ G. A-priv. + kardia, heart (05 Mar 2000) |
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| holoacardius acephalus | A holoacardius also lacking a head. (05 Mar 2000) |
| holoacardius amorphus | A holoacardius in which the body of the parasite is represented by only a shapeless mass. See: anideus. (05 Mar 2000) |
| holoacardius |
a separate, monozygotic twin represented by a more or less shapeless and unidentifiable mass; the vascular systems of the two fetuses are connected, and the circulation is accomplished solely by the heart of the more perfect twin.
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