[puh-pav-uh-reen, -er-in, puh-pey-vuh-reen, -ver-in]
noun Pharmacology.
a white, crystalline, nonnarcotic, alkaloidal powder, C 2 0 H 2 1 NO 4 , obtained from opium, but not a morphine derivative and not habit-forming or addicting, used in the treatment of spasms of involuntary muscle, especially of the stomach, bronchi, and arteries.

1855–60; < Latin papāver poppy + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
papaverine (pəˈpeɪvəˌriːn, -rɪn)
a white crystalline almost insoluble alkaloid found in opium and used as an antispasmodic to treat coronary spasms and certain types of colic. Formula: C20H21NO4
[C19: from Latin papāverpoppy]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

papaverine pa·pav·er·ine (pə-pāv'ə-rēn', -ər-ĭn)
A nonaddictive opium derivative used medicinally to relieve spasms of smooth muscle.

The American Heritage® Stedman's Medical Dictionary
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