Definition of cardio- in English:

cardio-

Pronunciation: /ˈkɑːdɪəʊ/

combining form

Relating to the heart: cardiograph cardiopulmonary

Origin

from Greek kardia 'heart'.

Definition of cardio- in:

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Word of the day animalcule
Pronunciation: ˌanəˈmalˌkyo͞ol
noun
a microscopic animal