either of two oval sex glands in the male that are suspended in the scrotum and secrete spermatozoa; testis
Origin of testicleClassical Latin testiculus, diminutive of testis, testicle, literally , witness (to virility): see testify
A testis, especially one contained within a scrotum.
Origin of testicleMiddle English testicule, from Latin testiculus, diminutive of testis, testis; see testis.
Often used in the plural, due to their usually being present as a pair.