tubocurarine
noun
tu·bo·cu·ra·rine
ˌtü-bō-kyu̇-ˈrär-ən
ˌtyü-,
-ˌēn
: a toxic alkaloid 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 has been used in the form of its hydrated hydrochloride C37H41ClN2O6·HCl·5H20 as a relaxant of skeletal muscle especially as an adjunct to anesthesia in surgery
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Merriam-Webster unabridged
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