NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,926 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

parietal pericardium
(puh-RY-uh-tul PAYR-ih-KAR-dee-um)
The outer layer of the pericardium, which is a thin sac of tissue that surrounds the heart.