go·nad 
(gōnăd′)
(gōnăd′)n.
An organ in animals that produces gametes, especially a testis or ovary.
[New Latin gonas, gonad-, from Greek gonos, procreation, genitals; see genə- in the Appendix of Indo-European roots.]
go·nadal (gō-nădl), go·nadic adj.