testicle

noun2

1. •
   A testis: the male sex and endocrine gland, found in most types of animals, that produces sperm and male sex hormones, including the steroid testosterone.

   • Despite your jogging and the hairiness of your legs, the shoe of aging is beginning to pinch. Soon you'll regret all that sun-tanning. Your face will look like a testicle. — 2000
2. •
   Either half of the structure that contains the testes: one side of the scrotum and its contents, considered as one object (one half of the ballsack, including its ball).