NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,894 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.

A chemical substance that kills sperm and is used as a type of birth control. It is available over-the-counter (without a doctor’s order) and comes in many different forms such as cream, gel, foam, and suppository. Spermicides can be used alone or with another birth control method such as a condom or diaphragm. They do not protect against sexually transmitted diseases (STDs).