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testis

[tes-tis] /ˈtɛs tɪs/
noun, plural testes
[tes-teez] /ˈtɛs tiz/ (Show IPA).
Anatomy, Zoology
1.
the male gonad or reproductive gland, either of two oval glands located in the scrotum.
Origin
1675-1685
1675-85; < Latin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for testis

testis

/ˈtɛstɪs/
noun (pl) -tes (-tiːz)
1.
another word for testicle
Word Origin
C17: from Latin, literally: witness (to masculinity)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for testis
n.

(plural testes), 1704, from Latin testis "testicle," usually regarded as a special application of testis "witness" (see testament), presumably because it "bears witness" to virility (cf. Greek parastates, literally "one that stands by;" and French slang témoins, literally "witnesses"). But Buck thinks Greek 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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testis in Medicine

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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testis in Science
testis
  (těs'tĭs)   
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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