Definition of steroid noun from the Oxford Advanced American Dictionary

 

steroid

 noun
noun
NAmE//ˈstɛrɔɪd//
 
, NAmE//ˈstɪrɔɪd//
 
 
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a chemical substance produced naturally in the body. There are several different steroids and they can be used to treat various diseases and are also sometimes used illegally by people playing sports to improve their performance.
See the Oxford Advanced Learner's Dictionary entry: steroid

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