steroid definition, meaning - what is steroid in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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steroid

noun [C] uk   /ˈste.rɔɪd/ /ˈstɪər.ɔɪd/  us   /ˈster.ɔɪd/  /ˈstɪr.ɔɪd/
one of the different types of chemical substances that are produced in the body an artificial form of a natural chemical substance that is used for treating particular medical conditions: I'm taking steroids/I'm on steroids for my asthma. a drug that increases the development of your muscles, sometimes taken illegally by people taking part in sports competitions
(Definition of steroid from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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