A swelling or tumor of the heart tissue, combining the Greek roots for heart (cardio-) and swelling (oncus).
From Greek 'kardia' (heart) + 'ogkos' (swelling, mass). The term emerged in medical terminology during the 19th century to describe pathological enlargements of cardiac tissue.
This word is a perfect example of how doctors build technical terms like building blocks—Greek 'cardio-' appears in hundreds of medical words because ancient physicians first studied the heart and gave us the language we still use today.
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