i Register
In some senses, cardiac is marked as archaic, dated. Watch for register when choosing this word.
adj
Pertaining to the heart.
the cardiac arteries
Pertaining to the cardia of the stomach; cardial (cardial is the usual adjective in this sense).
Exciting action in the heart, through the medium of the stomach; cordial; stimulant.
noun
A person with heart disease.
Heart disease.