Inside the heart.
Inter means to bury the earth
"Inter" means between
Cardiac is a medical term to refer to the heart.
Possibly you mean cardiac arrhythmia? This is a medical term for an irregular heartbeat.
Intermating
Between
Between
It means inside
The term cardiac means 'related to the heart' and comes from Greek for heart.
is it true your cardiac muscle tires
Cardiac silhouette is prominent with a left ventricular configuration.
"Cardiac" is an adjective that refers to the heart, e.g. cardiac muscle (aka the heart). A synonym (one of few), would be "heart-related."