Merriam-Webster's Collegiate® Dictionary, 11th Edition
CARDIAC
I. adjective
Etymology: Latin cardiacus, from Greek kardiakos, from kardia
Date: 1601
1. of, relating to, situated near, or acting on the heart, of or relating to the cardia of the stomach, of, relating to, or affected with heart disease ,
II. noun
Date: circa 1929
a person with heart disease