NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,798 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.

fetal
(FEE-tul)
Having to do with a fetus. A fetus is an unborn baby that develops and grows inside the uterus. In humans, the fetal period begins 8 weeks after fertilization of an egg by a sperm and ends at birth.