Pronunciation: (meth'u-dōn"), [key]
a synthetic narcotic, C21H28ClNO, similar to morphine but effective orally, used in the relief of pain and as a heroin substitute in the treatment of heroin addiction. Also,meth•a•donPronunciation: (meth'u-don"). [key]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.