define anabolic steroid
Full Definition of ANABOLIC STEROID. : any of a group of usually synthetic hormones that are derivatives of testosterone, are used medically especially to promote tissue growth, and are sometimes abused by athletes to increase the size and strength of their muscles and improve endurance.See anabolic steroid defined for English-language learners.nabolic steroid. noun. Tweet. : a drug that is sometimes used illegally by athletes to help them become stronger and more muscular.