Lewis & Short

testĭcŭlus, i, m. dim. [2. testis], a testicle.

  1. I. Lit., Auct. Her. 3, 20, 33; Juv. 6, 339; Mart. 3, 24, 5; Cels. 7, 18.
  2. II. Transf., as a designation of manly vigor, manliness: haec fierent, si testiculi vena ulla paterni Viveret in nobis? Pers. 1, 103.
  3. III. The name of a plant, App. Herb. 15.