1. Of, near, or relating to the heart: cardiac arteries. See Usage Note at coronary.
2. Of or relating to the cardia.
A person with a heart disorder.
[Middle English, from Latin cardiacus, from Greek kardiakos, from kardiā, heart; see kerd- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.