of or pertaining to the testes.

1650–60; < Latin testicul(us) testicle + -ar1

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World English Dictionary
testicle (ˈtɛstɪkəl)
Also called: testis either of the two male reproductive glands, in most mammals enclosed within the scrotum, that produce spermatozoa and the hormone testosterone
[C15: from Latin testiculus, diminutive of testis testicle]

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American Heritage
Medical Dictionary

testicular tes·tic·u·lar (tě-stĭk'yə-lər)
Of or relating to a testicle or testis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for testicular
Castration necessarily eliminates the risk of testicular cancer.
Elements of choriocarcinoma in a mixed testicular tumor have no prognostic importance.
Other studies implicated cyclohexylamine in testicular atrophy in mice.
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