[meth.a.done] also meth.a.don n [methyl + amino + diphenyl + -one] (1947): a synthetic addictive narcotic drug used esp. in the form of its hydrochloride for the relief of pain and as a substitute narcotic in the treatment of heroin addiction
METHADONE
Meaning of METHADONE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012