an unequal twin in which the heart is rudimentary, its circulation being assisted by the other twin.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
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]
Farlex Partner Medical Dictionary © Farlex 2012