Main Entry: tes·tis

Pronunciation: \ˈtes-təs\

Function: noun

Inflected Form(s): plural tes·tes \ˈtes-ˌtēz\

: a typically paired male reproductive gland that usually consists largely of seminiferous tubules from the epithelium of which spermatozoa develop, that contains androgen-secreting Leydig cells in the interstitial tissue, that corresponds to the ovary of the female and in craniate vertebrates develops from the genital ridges of the embryo, and that in most mammals descends into the scrotum before the attainment of sexual maturity and in many cases before birth

[testis illustration]