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

 

testis

 noun
noun
BrE BrE//ˈtestɪs//
 
; NAmE NAmE//ˈtestɪs//
 
(pl. testes
BrE BrE//ˈtestiːz//
 
; NAmE NAmE//ˈtestiːz//
 
)
(anatomy)
 
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a testicle Word Origin early 18th cent.: from Latin, literally ‘a witness’ (i.e. to virility). Compare with testicle.
See the Oxford Advanced American Dictionary entry: testis