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testis Syllabification: tes·tis
Pronunciation: /ˈtestəs/

Definition of testis in English:

noun (plural testes-ˌtēz)

Anatomy & Zoology
An organ that produces spermatozoa (male reproductive cells). Compare with testicle.
Example sentences
  • The passage of sperm from the seminiferous tubules of the testis to the vas deferens takes about 12 days.
  • The cavity of the pseudocoel is small, being mostly filled with an intestine and oviducts or testes.
  • The presence of a Y chromosome results in the somatic cells of the embryo's gonads developing into testes rather than into ovaries.


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

Words that rhyme with testis

Definition of testis in:
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