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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Example sentences
But the employees felt better about bosses who exercised, whether it was yoga,
  cardio or weight lifting.
The gym has a large stretching area, a selection of free weights and cardio
  machines that overlook the stern.
The large fitness center on the ship offers weight machines, treadmills and
  other cardio equipment.
The fitness center also has a gymnasium with cardio and weight training
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