hemiacardius

hemiacardius

 [hem″e-ah-kahr´de-us] an unequal twin in which the heart is rudimentary, its circulation being assisted by the other twin.

hem·i·a·car·di·us

(hem'ē-ă-kar'dē-ŭs), One of twin fetuses, in which only a part of the circulation is effected by its own heart, the rest by the heart of the other twin. [hemi- + G. a- priv. + kardia, heart]