| acardius anceps | An acardiac foetus with partly developed head and deformed face, trunk, and limbs. See: hemiacardius. (05 Mar 2000) |
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| acardius | A twin without a heart, parasitic on, or utilizing the placental circulation of, its mate. (05 Mar 2000) |
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| 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) |
| acardius amorphus | A shapeless mass covered by skin and hair. (05 Mar 2000) |