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⇱ cardio - WordReference.com Dictionary of English



WordReference Random House Unabridged Dictionary of American English © 2026
cardio-, 
  1. a combining form meaning "heart,'' used in the formation of compound words:cardiogram.
Also,[esp. before a vowel,] cardi-. 
  • Greek kardio-, combining form of kardía

Collins Concise English Dictionary © HarperCollins Publishers::
cardio-, (before a vowel) cardi- combining form
  1. heart: cardiogram
Etymology: from Greek kardia heart
'cardio' also found in these entries (note: many are not synonyms or translations):
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