hyoscine(n = noun.artifact)scopolamine - an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures; "someone sedated with scopolamine has difficulty lying"; "transdermal scopolamine is used to treat motion sickness"
An alkaloid found with hyoscyamine (with which it is also isomeric) in henbane, and extracted as a white, amorphous, semisolid substance. [1913 Webster]
, n. a poisonous alkaloid found in plants of the nightshade family, esp. of the genus Scopolia, and used as an antiemetic in motion sickness and a preoperative medication for examination of the eye. Also called SCOPOLAMINE.