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of or relating to the heart:
cardiac disease.
of or relating to the esophageal portion of the stomach.
Medicine/Medical. a cardiac remedy.
a person suffering from heart disease.
Contemporary Examples

“This was a respiratory arrest, not a cardiac arrest,” Steinberg said.
Murray’s Sloppy Paper Trail Diane Dimond November 6, 2011

The hope was that death would occur quickly in an unconscious senseless person both by cardiac and respiratory arrest.
The Death Penalty’s Gruesome Truth Kent Sepkowitz February 5, 2014

In general, there are two related but distinct physiological ways in which one might die suddenly from a cardiac event.
Heart Attack 101: What May Have Killed James Gandolfini Kent Sepkowitz June 19, 2013

But there are reports which say cannabis can be considered as a cause of death because it can induce a cardiac arrest.
British Mother ‘Poisoned’ To Death By Pot The Telegraph January 30, 2014

Basso said Alleman had a genetic predisposition for cardiac problems, as both of his parents died of heart attacks in their 50s.
The Heart Attack Grill Lives Up to Its Name David Frum February 12, 2013

Historical Examples

The cardiac limb of the stomach, which is large and heart-shaped, is obsolete.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

I had a sinking feeling in the cardiac region which does not go with mirth.
Mark Twain, A Biography, 1835-1910, Complete Albert Bigelow Paine

Death was often sudden, resulting chiefly from cardiac and respiratory complications.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 7 Various

It contains the element of touch, and in this it refers to the cardiac plexus.
Fantasia of the Unconscious D. H. Lawrence

Peacock found the proportion of cardiac complications in rheumatism to range from 16 to 40 per cent.
A System of Practical Medicine By American Authors, Vol. II Various

adjective
of or relating to the heart
of or relating to the portion of the stomach connected to the oesophagus
noun
a person with a heart disorder
(obsolete) a drug that stimulates the heart muscle
adj.

c.1600, from French cardiaque (14c.) or directly from Latin cardiacus, from Greek kardiakos “pertaining to the heart,” from kardia “heart” (see heart (n.)). Cardiac arrest is attested from 1950.

Greek kardia also could mean “stomach” and Latin cardiacus “pertaining to the stomach.” This terminology continues somewhat in modern medicine. Confusion of heart and nearby digestive organs also is reflected in Breton kalon “heart,” from Old French cauldun “bowels,” and English heartburn for “indigestion.”

cardiac car·di·ac (kär’dē-āk’)
adj.

Of, near, or relating to the heart.

Of, near, or relating to the cardia.

n.
A person with a heart disorder.
cardiac
(kär’dē-āk’)
Relating to or involving the heart.