Definition of testis in English:

testis

Syllabification: tes·tis
Pronunciation: /ˈtestis
 
/

noun (plural testes /-ˌtēz/)

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

Origin

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

Definition of testis in:

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Word of the day ween
Pronunciation: wiːn
verb
be of the opinion; think or suppose