noun, plural testes [tes-teez] . Anatomy, Zoology.
the male gonad or reproductive gland, either of two oval glands located in the scrotum.

1675–85; < Latin

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World English Dictionary
testis (ˈtɛstɪs)
n , pl -tes
another word for testicle
[C17: from Latin, literally: witness (to masculinity)]

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Word Origin & History

(pl. testes), 1704, from L. testis "testicle," usually regarded as a special application of testis "witness" (see testament), presumably because it "bears witness" to virility (cf. Gk. parastates, lit. "one that stands by;" and Fr. slang témoins, lit. "witnesses").
But Buck thinks Gk. parastatai "testicles" has been wrongly associated with the legal sense of parastates "supporter, defender" and suggests instead parastatai in the sense of twin "supporting pillars, props of a mast," etc. Walde, meanwhile, suggests a connection between testis and testa "pot, shell, etc."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

testis tes·tis (těs'tĭs)
n. pl. tes·tes (-tēz)
The male reproductive gland, the source of spermatozoa and the androgens, normally occurring paired in an external scrotum. Also called didymus, orchis.

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American Heritage
Science Dictionary
testis   (těs'tĭs)  Pronunciation Key 
Plural testes (těs'tēz)
The primary reproductive organ of male animals, in which sperm and the male sex hormones (androgens) are produced. In most vertebrates, the testes are contained inside the body. In many mammals, however, the testes are enclosed in an external scrotum.
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