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Definition of steroid noun from the Oxford Advanced Learner's Dictionary

 

steroid

 noun
noun
BrE BrE//ˈsterɔɪd//
 
; NAmE NAmE//ˈsterɔɪd//
 
; BrE also BrE//ˈstɪərɔɪd//
 
; NAmE also NAmE//ˈstɪrɔɪd//
 
Athletics
 
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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 related entries: Athletics Word Origin 1930s: from sterol + -oid.
See the Oxford Advanced American Dictionary entry: steroid

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