The NCI Dictionary of Cancer Terms features 7,791 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.
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A sleep disorder that is marked by pauses in breathing of 10 seconds or more during sleep, and causes unrestful sleep. Symptoms include loud or abnormal snoring, daytime sleepiness, irritability, and depression.