Definition:

testislisten (TES-tis)

One of two egg-shaped glands inside the scrotum that produce sperm and male hormones. Also called testicle.

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Anatomy of the male reproductive and urinary systems; drawing shows front and side views of ureters, lymph nodes, rectum, bladder, prostate gland, vas deferens, urethra, penis, testicles, seminal vesicle, and ejaculatory duct.