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English definition of “steroid”

steroid

noun [C]  /ˈster·ɔɪd, ˈstɪər-/ us  
biology, chemistry any of a large group of chemical substances produced in the body or in a plant, or an artificial form of these substances used to treat various medical conditions or to illegally improve sports performance
(Definition of steroid from the Cambridge Academic Content Dictionary © Cambridge University Press)
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