| acephalus sympus | An acephalus showing fusion of all of the lower limbs. (05 Mar 2000) |
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| sympus | A sirenomelus in which the fusion of the legs has extended to involve the feet. Origin: G. Sympous, fr. Sym-+ pous, foot (05 Mar 2000) |
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| sympus apus | A sirenomelus without feet. (05 Mar 2000) |
| sympus dipus | A sirenomelus with both feet more or less distinct. (05 Mar 2000) |
| sympus monopus | A sirenomelus with but one foot externally visible. (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) |
| holoacardius acephalus | A holoacardius also lacking a head. (05 Mar 2000) |