Plural of cardiology; multiple fields or approaches to the study of heart medicine.
Plural form of 'cardiology' from Greek 'kardia' (heart) + '-logia' (study of). The '-ies' ending marks the plural, though the word is rarely pluralized in practice.
While 'cardiologies' is grammatically correct, doctors rarely use this plural because cardiology is a unified discipline—you won't hear someone say 'there are several cardiologies' in practice.
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