(medicine, anatomy) Lacking a heart.

(medicine) A deformed fetus having developed no heart, and otherwise being a shapeless lump with only rudiments of organs, connected as a parasite to another fetus.

(medicine) A deformed fetus for which development of the heart, head and extremities are all rudimentary, connected as a parasite to another fetus.

(medicine) A deformed fetus having developed no heart, connected as a parasite to another fetus.

(medicine) A deformed fetus having developed no heart, a stunted head, and a rudimentary thorax, but with a perfectly formed pelvis and contiguous parts, connected as a parasite to another fetus.

plural of acardiacus