testicle

noun
🔊/ˈtestɪkl/
🔊/ˈtestɪkl/
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  1. either of the two organs that produce sperm, located in a bag of skin below the penis睾丸Topics Bodyc2
    Word Originlate Middle English: from Latin testiculus, diminutive of testis ‘a witness’ (i.e. to virility).