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virilization

British  
/ ˌvɪrɪlaɪˈzeɪʃən /

noun

  1. the development of adult male physical characteristics in a female or a young boy

"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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The hormone cortisol, recently synthesized in the lab, had been found to arrest the virilization these girls normally underwent, allowing them to develop as normal females.

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