English
methadone
From (di)meth(yl)a(mino) + d(iphenyl) + (heptan)one.
Formed from dimethylamino + diphenyl + heptanone
Today it means
noun A powerful synthetic analgesic drug which is similar to morphine in its effects but less sedative and is used as a substitute drug in the treatment of morphine and heroin addiction.
Language periods are conventional ranges, not dates for this word.
Etymograph / methadone