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