NCI Dictionary of Cancer Terms

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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.

premature birth
(PREE-muh-CHOOR berth)
The birth of a baby before 37 weeks of pregnancy. In humans, a normal pregnancy lasts about 40 weeks. The risk of premature birth may be increased by certain health problems in the mother, such as diabetes, heart disease, and kidney disease, or problems during pregnancy. Smoking cigarettes, being exposed to secondhand tobacco smoke, drinking alcohol, and taking certain drugs during pregnancy may also increase the risk of a premature birth. Also called preterm birth.