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.

ethylene oxide
(EH-thuh-leen OK-side)
A chemical used to make antifreeze, to clean medical equipment, and as a pesticide. It is also found in tobacco smoke. Being exposed to ethylene oxide can cause lung damage, headache, nausea, vomiting, diarrhea, and shortness of breath. Being exposed over a long time may increase the risk of certain types of cancer.