One of the paired male reproductive organs that produce spermatozoa and male sex hormones in humans and other vertebrates.
An analogous gland in an invertebrate animal, such as a flatworm or a mollusk.
The primary reproductive organ of male animals, in which sperm and the male sex hormones (androgens) are produced. In most vertebrates, the testes are contained inside the body. In many mammals, however, the testes are enclosed in an external scrotum.
American Heritage Dictionary of the English Language, 5th Edition
Testis Sentence Examples
In C. nigrescens and in some other species a zooid may contain a pair of ovaries, a pair of testes, or an ovary and a testis, although the males, females and hermaj phrodites do not differ from one another in external characters.
The testis is a single compact organ.
Recent research, however, points to these cords of the rete testis et ovarii as being derived from the coelomic epithelium instead of from the mesonephros.