NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,804 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.

affinity
(uh-FIH-nih-tee)
In chemistry and biology, the strength of the attaction between two substances, such as two chemicals, or an antigen and an antibody.