NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,863 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.

somnolence syndrome
(SOM-noh-lens SIN-drome)
Periods of drowsiness, lethargy, loss of appetite, and irritability in children following radiation therapy treatments to the head.