papaverine

 
Pronunciation: /pəˈpeɪvərʌɪn, -ˈpav-, -iːn/

noun

[mass noun] Chemistry
  • a compound present in opium used medicinally to alleviate muscle spasm and asthma.
    • An alkaloid; chemical formula: C20H21NO4

Origin:

mid 19th century: from Latin papaver 'poppy' + -ine4