atropine

at·ro·pine   (āt'rə-pēn', -pĭn)    n.  A poisonous, bitter, crystalline alkaloid, C17H23NO3, obtained from belladonna and other related plants. It is used to dilate the pupils of the eyes and as an antispasmodic. [From New Latin Atropa, genus name of belladonna, from Greek Atropos, Atropos; see Atropos.]

Main Entry: at·ro·pine
Pronunciation: 'a-tr&-"pEn
Function: noun
: a racemic mixture of hyoscyamine usually obtained from belladonna andrelated plants of the family Solanaceae and used especially in the form of its sulfate for its anticholinergic effects (as relief of smooth muscle spasms or dilation of the pupil of the eye)

atropine at·ro·pine (āt'rə-pēn', -pĭn) or at·ro·pin (-pĭn)
n.
An alkaloid obtained from belladonna and related plants, used to dilate the pupils of the eyes and as an antispasmodic, antisudorific, and anticholinergic.