Webster's English Dictionary

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atropine

at.ro.pine \'a-tr*-.pe-n, -pe-n\ n [G atropin, fr. NL Atropa, genus name of 
   belladonna, fr. Gk Atro]pos : a poisonous white crystalline alkaloid 
   C17H23NO3 from  belladonna and related plants used esp. to relieve spasms 
   and to dilate the pupil of the eye