NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,913 terms related to cancer and medicine.

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abnormal
(ab-NOR-mul)
Not normal. Describes a state, condition, or behavior that is unusual or different from what is considered normal. An abnormal lesion or growth in or on the body may be benign (not cancer), precancerous or premalignant (likely to become cancer), or malignant (cancer).