propoxyphene
noun
pro·poxy·phene
prō-ˈpäk-sə-ˌfēn
: a narcotic analgesic C22H29NO2 structurally related to methadone but less addicting that is administered especially in the form of its salts (such as the hydrochloride) and has been largely withdrawn from use because of its link to serious heart disorders
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Merriam-Webster unabridged
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