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a combining form meaning “heart,” used in the formation of compound words:
Also, especially before a vowel, cardi-.
Origin of cardio-
< Greek kardio-, combining form of kardía Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for cardio


combining form
heart: cardiogram
Word Origin
from Greek kardia heart
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for cardio


before vowels cardi-, word-forming element meaning "pertaining to the heart," from Latinized form of Greek kardia "heart" (see heart (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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cardio in Medicine

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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