atropine

 
Pronunciation: /ˈatrəpiːn, -ɪn/

noun

[mass noun] Chemistry
  • a poisonous compound found in deadly nightshade and related plants. It is used in medicine as a muscle relaxant, e.g. in dilating the pupil of the eye.
    • An alkaloid; chemical formula: C17N23NO3

Origin:

mid 19th century: modern Latin Atropa belladonna 'deadly nightshade', from Atropos + -ine4