testicle

 
Pronunciation: /ˈtɛstɪk(ə)l/

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

Derivatives

testicular

Pronunciation: /-ˈstɪkjʊlə/
adjective

Origin:

late Middle English: from Latin testiculus, diminutive of testis 'a witness' (i.e. to virility)