/ ˈsterɔɪd; NAmE ; BrE also ˈstɪər-; NAmE also ˈstɪr-/ noun
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.
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WORD ORIGIN
1930s: from sterol + -oid .