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testosterone

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testosterone/tɛˈstɑːstəˌroʊn/noun
testosterone
/tɛˈstɑːstəˌroʊn/
noun
Learner's definition of TESTOSTERONE  
[noncount]
medical  : a substance (called a hormone) that occurs naturally in men and male animals
◊ Testosterone causes the development of the male reproductive system and characteristics of the adult male body.
informal + often disapproving  : qualities (such as noticeable strength and aggressiveness) that agree with traditional ideas about what men are like
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