| holoacardius acephalus | A holoacardius also lacking a head. (05 Mar 2000) |
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| 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 amorphus | A holoacardius in which the body of the parasite is represented by only a shapeless mass. See: anideus. (05 Mar 2000) |
| acardius acephalus | Acephalocardius;an acardiac foetus in which the head and thoracic organs are absent. Ribs and vertebrae may be present, and upper limbs are either absent or defective. (05 Mar 2000) |
| acephalus | A headless foetus. Synonym: acephalous. Origin: G. A-priv. + kephale, head (05 Mar 2000) |
| acephalus acormus | Condition in which a head without a body is attached to the placenta by an umbilical cord. (05 Mar 2000) |
| acephalus dibrachius | A foetus lacking a head but having two recognizably developed upper limbs. (05 Mar 2000) |
| acephalus dipus | A foetus lacking a head but showing two recognizably developed lower limbs. (05 Mar 2000) |
| acephalus monobrachius | A foetus lacking a head and showing only one recognizable upper limb. (05 Mar 2000) |
| acephalus monopus | A foetus lacking a head and with fusion of the lower extremities so extreme that only a single foot is recognizable. (05 Mar 2000) |
| acephalus paracephalus | A malformed foetus with only partially developed skull and little or no brain. (05 Mar 2000) |
| acephalus sympus | An acephalus showing fusion of all of the lower limbs. (05 Mar 2000) |