Definition of testis in English:

testis

Line breaks: tes¦tis
Pronunciation: /ˈtɛstɪs
 
/

noun (plural testes /-tiːz/)

Anatomy & Zoology
An organ which produces spermatozoa (male reproductive cells). Compare with testicle.

Origin

early 18th century: from Latin, literally 'a witness' (i.e. to virility). Compare with testicle.

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