testosterone

noun2

1. •
   A steroid hormone that stimulates development of male secondary sexual characteristics, produced mainly in the testes, but also in the ovaries and adrenal cortex.

   • Mammalian testes contain almost no testosterone because it is sent out into the body as quickly as it is made. — 2019
2. •
   (figurative) Manly behavior, often of an aggressive or foolishly reckless nature.

   • Mother encouraged James to rely more on intelligence and less on testosterone to deal with the neighbor's son.