a combining form meaning “heart,” used in the formation of compound words: cardiogram.
Also, especially before a vowel, cardi-.

< Greek kardio-, combining form of kardía Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cardio- or (before a vowel) cardi-
combining form
heart: cardiogram
[from Greek kardia heart]
cardi- or (before a vowel) cardi-
combining form
[from Greek 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

comb. form of Gk. kardia "heart" (see heart). cardiogram is from 1876; cardiologist from 1885; cardiology from 1847.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cardio- or cardi-

  1. Heart: cardiovascular.

  2. Cardia: cardiodiosis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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