testosterone

[tes-tos-tuh-rohn]
noun
1.
Biochemistry. the sex hormone, C 19 H 28 O 2 , secreted by the testes, that stimulates the development of male sex organs, secondary sexual traits, and sperm.
2.
Pharmacology. a commercially prepared form of this compound, originally isolated from bull's testes and now also produced synthetically, used in medicine chiefly for treatment of testosterone deficiency and for certain gynecological conditions.

Origin:
1930–35; testo- (combining form of testis) + ster(ol) + -one

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World English Dictionary
testosterone (tɛˈstɒstəˌrəʊn)
 
n
a potent steroid hormone secreted mainly by the testes. It can be extracted from the testes of animals or synthesized and used to treat androgen deficiency or promote anabolism. Formula: C19H28O2
 
[C20: from testis + sterol + -one]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

testosterone
male sex hormone, 1935, from Ger. Testosteron (1935), coined from L. testis "testicle" (see testis) + ster(ol) (see steroid) + chemical ending -one.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

testosterone tes·tos·ter·one (těs-tŏs'tə-rōn')
n.
A steroid hormone and the most potent naturally occurring androgen that is formed by the interstitial cells of the testes, and possibly by the ovary and adrenal cortex, may be produced in nonglandular tissues from precursors such as androstenedione, and is used in the treatment of hypogonadism, cryptorchism, carcinomas, and menorrhagia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
testosterone   (těs-tŏs'tə-rōn')  Pronunciation Key 
A steroid hormone that is the most potent naturally occurring androgen and that regulates the development of the male reproductive system and male secondary sex characteristics. Testosterone is produced mainly in the testes and is also used as a drug in the treatment of certain medical disorders. Chemical formula: C19H28O2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
testosterone [(tes-tos-tuh-rohn)]

A male hormone that governs secondary sex characteristics. It is produced in the testes.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for testosterone
Total testosterone is negatively correlated with verbal fluency.
Removing or blocking estrogen or testosterone is often an important additional treatment.
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