NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,899 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.

chorioallantoic membrane
(KOR-ee-oh-uh-lan-TOH-ik MEM-brayn)
The membrane in hens' eggs that helps chicken embryos get enough oxygen and calcium for development. The calcium comes from the egg shell.