Medical Definition of tubocurarine
: a toxic alkaloid that is obtained chiefly from the bark and stems of a South American vine (Chondrodendron tomentosum of the family Menispermaceae), that in its dextrorotatory form constitutes the chief active constituent of curare, and that is used in the form of its hydrated hydrochloride C37H41ClN2O6·HCl·5H2O especially as a skeletal muscle relaxant
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