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Meaning of methadone

meth•a•done

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