What is Steroid ?

Steroid is (noun) 1. one of several natural chemical compounds which affect the body and its functions 2. a synthetic chemical used to treat some disorders and also used by some athletes to improve their strength The random sample of urine obtained from the athlete proved that he had been taking ste- roids. She was banned from competing af- ter tests showed that she had taken steroids.


source: Easier English, Student Dictionary Upper Intermediate Level