1. A poisonous alkaloid drug obtained from the deadly nightshade plant, used in medicine to dilate the pupil of the eye and to treat certain types of poisoning.
Usage: Also spelled atropine (more common modern spelling).; Medical/pharmaceutical term.

Examples

• The ophthalmologist applied atropin drops to dilate the patient's pupils for the eye exam.
• Atropin is derived from plants in the nightshade family.
• In cases of nerve agent poisoning, atropin can be administered as an antidote.
• The medication atropin blocks certain nerve signals in the body.
• Atropin has been used in medicine for centuries, though its use requires careful dosing.