IPA: /ˌɪntrəˈkɑːrdiæk/
KK: /ɪntrəˈkɑrdɪæk/
Located inside the heart or related to the heart's interior.
The doctor performed an intracardiac procedure to treat the patient's condition.
Intracardiac is formed from "intra-" (meaning within) and "cardiac" (from Greek "kardiakos", meaning related to the heart). The word refers to something that occurs within the heart.
Think of 'intra-' meaning 'within' and 'cardiac' relating to the 'heart' — this helps you remember that intracardiac refers to something happening inside the heart.