TESTICLE (testis), a double part in animals of the male kind, serving for the office of generation.—See ANAT. no 371. They are called testicles, by diminution of testes, "witnesses;" as giving testimony of virility. The Greeks call them didymi, or twins.
In man and most animals, the testicles are exterior; in some, as fowls, interior. Some men have only one, ordinarily they have two; some have naturally had three; nay, anatomists assure us they have known four.