Testis Definition
 tĕstĭs 
  testes
  
    noun
  
 
    testes
  
One of the paired male reproductive organs that produce spermatozoa and male sex hormones in humans and other vertebrates.
 American Heritage Medicine 
Webster's New World 
An analogous gland in an invertebrate animal, such as a flatworm or a mollusk.
 American Heritage Medicine 
(anatomy) A testicle of a vertebrate.
Wiktionary 
Origin of Testis
-  
Latin witness, testis testify
From American Heritage Dictionary of the English Language, 5th Edition
 
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