(The following quoted text is from the free Wikipedia:)
A gonad, sex gland, or reproductive gland is a mixed gland that produces the gametes (sex cells) and sex hormones of an organism. In the female of the species the reproductive cells are the egg cells, and in the male the reproductive cells are the sperm. The male gonad, the testicle, produces sperm in the form of spermatozoa. The female gonad, the ovary, produces egg cells. Both of these gametes are haploid cells.
the definition of sex gland, Dictionary.com. Retrieved 8 May 2018.
gonad (noun) American English definition and synonyms, Macillan Dictionary. Retrieved 8 May 2018.