Definition of testicle noun from the Oxford Advanced Learner's Dictionary

 

testicle

 noun
noun
BrE BrE//ˈtestɪkl//
 
; NAmE NAmE//ˈtestɪkl//
 
 
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either of the two organs that produce sperm, located in a bag of skin below the penis Word Origin late Middle English: from Latin testiculus, diminutive of testis ‘a witness’ (i.e. to virility).
See the Oxford Advanced American Dictionary entry: testicle