Testes define
Testes. The pair of male reproductive glands enclosed in the scrotum that produce the male sex hormone testosterone and the spermatozoa. The singular form is testis.
Definition of TESTIS. : a typically paired male reproductive gland that produces sperm and secretes testosterone and that in most mammals is contained within the scrotum at sexual maturity. See testis defined for English-language learners. See testis defined for kids.