Acardiac
The Century Dictionary and Cyclopedia
Without a heart.
the GNU version of the Collaborative International Dictionary of English
adjective.
Without a heart.
Wiktionary, Creative Commons Attribution/Share-Alike License
adjective.
Lacking a
heart
.
Word Usage
"When blood flows in reverse through an acardiac twin (one without a functioning heart) as it is pumped by the other, typically normal twin."
Form
acardiac twin
acardiac twinning