The noun cardiologist means a doctor who specializes in the heart and the treatment of its diseases.
Synonyms are heart specialist, heart doctor, heart surgeon, or cardiac surgeon.
The word origins from the assimilation of suffix –ologist meaning “someone who studies some area”, plus cardio– from the Greek word kardia meaning “heart”. It was first used in 1885 following the word cardiology (1847) meaning “study of the heart”.
She advised me to see a cardiologist.
The team will wait for the approval from her cardiologist before they start the surgery.
We rushed her to the hospital and a bleary-eyed cardiologist came to examine her.