/ ˈtestɪkl; NAmE / noun
either of the two organs that produce sperm , located in a bag of skin below the penis
► tes·ticu·lar / tesˈtɪkjələ(r); NAmE / adjective [ only before noun ]:
testicular cancer
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WORD ORIGIN
late Middle English : from Latin testiculus , diminutive of testis a witness (i.e. to virility).