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Testis is the medical anatomical term. Testis/testicles are the same thing. Testis/testicles are responsible for the production of male hormones and sperm.

Testis and testicles are NOT the same thing. "Testis" is the singular form and "testes" is its plural. "Testicles" is the plural of "testicle."

I'm not as certain of this, but I've come to believe that a testicle is an abnormally small testis.

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11y ago

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