You searched for: “acardias”
acardia (s) (noun), acardias (pl)
1. A congenital absence of a heart, sometimes occurring in the smaller member of conjoined twins when its partner monopolizes the placental blood supply: As indicated in this definition, some congenital twins have just one heart for both bodies; that is, one has a heart and the other one is acardia.
The veterinarian found out that the calf was born as an acardia and so it had no chance of even being born alive.2. Having no heart: It hardly seems very romantic to describe Jane's ex-boyfriend as having acardia.