thorn apple

noun

1. any poisonous plant belonging to the genus Datura, of the nightshade family, the species of which bear capsules covered with prickly spines, especially the jimson weed, D. stramonium.
2. the fruit of certain hawthorns of the genus Crataegus.

noun

1. a poisonous solanaceous plant, Datura stramonium, of the N hemisphere, having white funnel-shaped flowers and spiny capsule fruitsUS and Canadian name: jimson weed See also stramonium
2. any other plant of the genus Datura
3. the fruit of certain types of hawthorn