a synthetic drug used in the treatment of asthma and respiratory diseases and also in veterinary obstetrics. It also promotes the growth of muscle and has been used illegally by athletes to enhance performance.
1970s: from c(h)l(oro-) + (ph)en(yl) + but(yl) + er+ -ol
clenbuterol in other Oxford dictionaries
Definition of clenbuterol in the US English dictionary