/teˈstɑːstəroʊn/
tes·tos·ter·one
BrE /teˈstɒstərəʊn/
NAmE /teˈstɑːstəroʊn/
a hormone (= chemical substance produced in the body) that causes men to develop the physical and sexual features that are characteristic of the male body
➡ compare oestrogen, progesterone