Definitions for "Gonad"
One of the masses of generative tissue primitively alike in both sexes, but giving rise to either an ovary or a testis; a generative gland; a germ gland.
Sex gland: female ovary or male testicle
an organ that produces cells (oocytes, spermatozoa) and hormones (estrogen, progesterone, testosterone) necessary for reproduction ( e.g., ovary [female] or testis [male]).