/ klenˈbjuːtərɒl; NAmE -rɑːl/ noun
[ U ] ( medical ) a drug that is used to treat asthma but that has also been used illegally by people who compete in sports, in order to build muscle
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WORD ORIGIN
1970s: from c(h)l(oro-) + (ph)en(yl) + but(yl) + er + -ol .