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cardio-

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

Origin of cardio-

< Greek kardio-, combining form of kardía
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for cardio-

cardio-

before a vowel cardi-

combining form
  1. heartcardiogram
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Word Origin for cardio-

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

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.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

cardio- in Medicine

cardio-

pref.
  1. Heart:cardiovascular.
  2. Cardia:cardiodiosis.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.