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

1400–50; late Middle English (< Middle French cardiaque) < Latin cardiacus < Greek kardiakós, equivalent to kardí(a) heart + -akos -ac

postcardiac, adjective
precardiac, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cardiac (ˈkɑːdɪˌæk)
1.  of or relating to the heart
2.  of or relating to the portion of the stomach connected to the oesophagus
3.  a person with a heart disorder
4.  obsolete a drug that stimulates the heart muscle
[C17: from Latin cardiacus, from Greek, from kardia heart]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, from Fr. cardiaque, from L. cardiacus, from Gk. kardiakos, from kardia "heart" (see heart). Cardiac arrest is attested from 1950.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cardiac car·di·ac (kär'dē-āk')

  1. Of, near, or relating to the heart.

  2. Of, near, or relating to the cardia.

A person with a heart disorder.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
cardiac   (kär'dē-āk')  Pronunciation Key 
Relating to or involving the heart.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Coronary angiography is usually done along with cardiac catheterization.
Lessons learned from newts, fish, and mutant mice could help humans repair
  cardiac damage.
The city's central hospitals reflect this growth, with new facilities springing
  up for cancer and cardiac care.
Normal cardiac artery walls are about a millimeter thick.
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