papaverine
noun
pa·pav·er·ine
pə-ˈpa-və-ˌrēn
-ˈpav-rən,
-ˈpa-və-
: a crystalline alkaloid C20H21NO4 found in opium or made synthetically that is used usually in the form of its hydrochloride chiefly as an antispasmodic for its ability to relax smooth muscle
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Merriam-Webster unabridged
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