testis
noun
- internal organ used in the male reproductive system
Wiktionary
noun
Etymology: Learned borrowing from Latin testis.
- A testicle of a vertebrate.
“In the Middle Ages, for instance, a recipe for sex stimulation required the putrefied flesh of a human corpse, together with both human and animal testes and ovaries, pimento, and alcohol.”
- An analogous gland in invertebrates such as the hydra.