NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,209 terms related to cancer and medicine.

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testosterone
(tes-TOS-teh-rone)
A hormone made mainly in the testes (part of the male reproductive system). It is needed to develop and maintain male sex characteristics, such as facial hair, deep voice, and muscle growth. Testosterone may also be made in the laboratory and is used to treat certain medical conditions.