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testis Line breaks: tes¦tis
Pronunciation: /ˈtɛstɪs/

Definition of testis in English:

noun (plural testes ˈtɛstiːz)

Anatomy & Zoology
An organ which 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

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