Noun, pl. gonads
1. The organ that makes gametes. The gonads in males are the testes, and the gonads in females are the ovaries. The product, gametes, are haploid germ cells. For example, spermatozoon and egg cells are gametes. (wikipedia.org)
2. A sex organ that produces gametes; specifically, a testicle or ovary. (wiktionary.org)
3. (Slang, in the plural) The testicles. (wiktionary.org)
4. Sex gland; a gland in which gametes (sex cells) are produced. (wordnetweb.princeton.edu)
Word origin: From Modern Latin gonas (plural gonades), coined from Greek gone, gonos “seed, act of generation, race, family,” from gignesthai “be born,” related to genos “race, birth, descent”.