Definition of testicle in US English:

testicle

noun

  • Either of the two oval organs that produce sperm in men and other male mammals, enclosed in the scrotum behind the penis.

    Also called testis

Origin

Late Middle English: from Latin testiculus, diminutive of testis ‘a witness’ (i.e. to virility).

Pronunciation

testicle

/ˈtɛstək(ə)l//ˈtestək(ə)l/