| holoacardius amorphus | A holoacardius in which the body of the parasite is represented by only a shapeless mass. See: anideus. (05 Mar 2000) |
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| acardius amorphus | A shapeless mass covered by skin and hair. (05 Mar 2000) |
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| amorphus | A malformed foetus with rudimentary head, limbs, and heart. Origin: G. A-priv. + morphe, form, shape (05 Mar 2000) |
| 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) |
| holoacardius acephalus | A holoacardius also lacking a head. (05 Mar 2000) |