Definition of cardio- in English:

cardio-

Syllabification: cardio-

combining form

Of or relating to the heart: cardiograph cardiopulmonary

Origin

from Greek kardia 'heart'.

Definition of cardio- in:

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected