Relating to or affecting the testicles, which are the male reproductive glands that produce sperm.
From Latin testiculus, a diminutive of testis meaning 'witness.' Romans called testicles 'witnesses' because they testified to manhood and fertility. The medical term evolved through Late Latin and became standardized in scientific terminology.
The Romans literally called testicles 'little witnesses'—testiculus—because they were evidence of masculinity and reproductive capability. That same Latin root 'testis' gave us 'testify' and 'testimony,' since witnesses were the proof in court, just as testicles were proof of manhood.
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